Malicious PDF — malware analysis report

Static analysis result for SHA-256 8751cbb85afdd38a…

MALICIOUS

PDF

77.8 KB Created: 2021-04-09 05:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6f87b99181774ff3a6136cf73823584b SHA-1: b8c73cc1275681702c04a050f94f771e8b97b210 SHA-256: 8751cbb85afdd38a59501464d216792a3660e033431bdc8d45aa16fa83b591ea
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=charlie+and+the+chocolate+factory+musical+tour+review PDF link annotation
    • http://limons.space/unexpected_eof_golang_templatea685c.pdfIn PDF document text
    • http://geloritiveda.mygamesonline.org/zerasuxejesufixovijefaxid.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/10323841851.pdfIn PDF document text
    • http://flathead.us/how_to_trade_short_term_stocksecgjn.pdfIn PDF document text
    • http://rawenspant.online/xopalibapipapanijexoljbarj.pdfIn PDF document text
    • http://nazhivy.net/vemibudotagm6on8.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/65162174376.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/xofunejafiji.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/valimem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d9c73feb-c945-4d97-9d44-ff62a4b57c47.filesusr.com/ugd/12056e_6a89595d465d4c54ab1618b9e36e9a07.pdf?index=trueIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_02420407e490400ca597ba748938b3d7.pdf?index=trueIn PDF document text
    • http://wuwedilejom.myartsonline.com/zeredijorezipugobon.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_661d3e02ffe74ea3a19df91e4536bd43.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/samsung_galaxy_note_4_display_price_in_nepal.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_af6cb2a10b8e41fcb7e9f26524da2204.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_4f33745b617847f9ac6a9967e4d23cb2.pdf?index=trueIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_9478caac64304929bf7a3ab49cd78f47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/jugs_pitching_machine_owners_manual.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_851ec71071ea4cb7b705c3063112f267.pdf?index=trueIn PDF document text
    • http://rivenoke.onlinewebshop.net/92885014068.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_4784486e66c24349bc8e63ee5de0e807.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 5420 bytes
SHA-256: 368714a856f8aa6d4c49912928f6e97ccd49d33b171c8edfaaf79db1695e9d22
font_01_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 10880 bytes
SHA-256: aedabe9fc6c99836a1a18a3b9d0c4ed2154e840d163ac3ffc4a979e60cd4f969

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