Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9344f0d20c8ec61…

MALICIOUS

PDF

87.0 KB Created: 2021-05-13 20:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d57ebd3b5c128518c7951054d7b8d08f SHA-1: ac95873d09d0607f6b9d2a5e554c68e509835d3f SHA-256: f9344f0d20c8ec619625d0752c97fd92b013c846269976c63a66b7d107d2c905
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, with one prominent URL being https://ponafet.ru/strik?utm_term=how+to+get+baby+g+shock+off+military+time. The document body is heavily obfuscated and appears to be a lure, possibly related to search engine optimization or directing users to malicious sites. No scripts were extracted, but the PDF structure itself is used to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=how+to+get+baby+g+shock+off+military+time PDF link annotation
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/7e4261ba6e.pdfIn PDF document text
    • https://womarunere.weebly.com/uploads/1/3/4/3/134315700/pidusovasudovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456135/normal_5fd93ea1bc5fb.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/92175242363.pdfIn PDF document text
    • http://jesibijifinuz.mywebcommunity.org/wukofidemivude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_60305fd081480.pdfIn PDF document text
    • https://zugatuwedi.weebly.com/uploads/1/3/0/8/130874050/lepinubowe_runixu_zunita_vevezokosof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469370/normal_5ffa3235837e8.pdfIn PDF document text
    • http://gajuduxotam.iblogger.org/94105648810.pdfIn PDF document text
    • http://sizegivip.22web.org/xejibudezifexogemoligugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5fc5a4452d7df.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/c381c160d66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_606c659e69edf.pdfIn PDF document text
    • https://zixaxufomomofir.weebly.com/uploads/1/3/0/7/130738537/natete-bupad-wimujuziditis.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/jjsmithonline_green_smoothie_recipes_day_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/db873c77-0794-4bf2-986a-f55c84623e9d/69474847748.pdfIn PDF document text
    • http://purezaviwof.myartsonline.com/77184704081.pdfIn PDF document text
    • http://panexorumilogim.myartsonline.com/ahle_hadees_books_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cefefee-c237-49bc-bb2e-843da8d7fde5/directv_genie_mini_not_responding_to_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6f118b-7903-45fe-9805-d4457adefa4c/netarizitijibufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5102c62d-94c4-4a65-8156-8354b2f6ccac/kivonajenosokagofutalox.pdfIn PDF document text
    • http://zotijoxamofos.epizy.com/toyota_camry_2020_new_car_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc17306b-06f8-4c44-8536-6a6c33926499/duwuteminotenufebogir.pdfIn PDF document text
    • http://xovebezot.rf.gd/90978732161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0a34e6-e80c-42b7-abc2-2a03bf17a488/tone_mood_of_poems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d4ed8c-abb3-4b4c-9b34-3216cf3e3a91/kitchenaid_professional_600_stand_mixer_6_quart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a5f3c5-51a7-42ab-98ad-0bfac1306ab0/toxojujafotazelon.pdfIn PDF document text
    • http://lekirajadu.epizy.com/zopugifemav.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 5336 bytes
SHA-256: a13fd0078422d568c417442d10099dba1cc1fdfd5f8a8448ba0a90e83e4a7852
font_01_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 10876 bytes
SHA-256: 0ed9677a49b0454910f634c20bc21c61f9bb0e9dad2d8ed77e35818ec28bc167
font_02_sfnt_off00014014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14014 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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