Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e137705f0c54f06…

MALICIOUS

PDF

91.7 KB Created: 2021-05-24 16:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6a41277dbefed2a9919ccaae9c1a64ed SHA-1: 5d56c2003b0f4557ec5dcf8861881fffc7991e32 SHA-256: 6e137705f0c54f06c30cc8b33c50d861dec0c5726c3dd0b32395502f6e589c3c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDFs, indicating a link farm for SEO manipulation. One prominent URL, https://jottigo.ru/strik?utm_term=the+ancient+secret+of+the+flower+of+life+vol+3, is directly embedded and likely serves as the primary lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jottigo.ru/strik?utm_term=the+ancient+secret+of+the+flower+of+life+vol+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379476/normal_604744d51c7bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460981/normal_5fec167c21a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_6063d3339482e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_6041925640e55.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/govixowojowujozimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_60309719d2500.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_60050463101b0.pdfIn PDF document text
    • https://zuvigopujipo.weebly.com/uploads/1/3/0/9/130969218/dajisusis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_6000e4b173d1a.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://s3.amazonaws.com/wipotegadodorek/82803218964.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/abhisarika_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f9d494-c597-4283-bc57-5fbd5f8eb8ab/dewalt_impact_driver_xr_lowes.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/zekububitazuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/clash_of_clans_hack_game_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c0223a-e729-46a7-8259-42af82483afb/hungry_shark_evolution_mod_apk_download_2.5_0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12a71a5-dc92-4aea-b5ef-b28ea3ee807b/what_is_the_best_chefs_choice_electric_knife_sharpener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919da580-cbd4-4b41-aca0-25d805a25d5d/how_many_watts_is_ultimate_ears_megaboom.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/kabezaturedinef.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/lofoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/jump_attack_bloodborne.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_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 5024 bytes
SHA-256: f7a63ae8f0883682895a88b7b05fdee7bc6c7081da02133d0d150aa1e04051e0
font_01_sfnt_off000128cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CF 13044 bytes
SHA-256: 32c68a02970214e7c493544d8059aff2b4bc9c4d60d885f3d115bc0cca9ee964
font_02_sfnt_off000153fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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