Malicious PDF — malware analysis report

Static analysis result for SHA-256 db85cbccebd75021…

MALICIOUS

PDF

126.5 KB Created: 2021-05-23 15:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 639c477166d8a6a2f7b2e67680c95d0c SHA-1: 0b364bafc2016f4c84e20d1d1b7be83f4111cdc0 SHA-256: db85cbccebd7502158941c489ab81e0daff027108a1cdfe4ba1caf6dd04fa1cb
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and ML classifiers, and it contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO abuse. One of the embedded URLs, 'https://maypoin.ru/strik?utm_term=developing+tactics+for+listening+audio+script+pdf', is directly associated with the document's content. The PDF structure and the presence of embedded links indicate a potential phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=developing+tactics+for+listening+audio+script+pdf PDF link annotation
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/4155633.pdfIn PDF document text
    • https://dokebama.weebly.com/uploads/1/3/2/6/132681336/cb7bdb41f1830.pdfIn PDF document text
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/7166039.pdfIn PDF document text
    • https://kabuxezalexafa.weebly.com/uploads/1/3/0/8/130814122/8335211.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/kanamojoxepizabifaki.pdfIn PDF document text
    • https://vajigapevinukaz.weebly.com/uploads/1/3/4/5/134578345/a4855ddba26.pdfIn PDF document text
    • https://xaxarudo.weebly.com/uploads/1/3/0/7/130740130/xesax.pdfIn PDF document text
    • https://gemirolav.weebly.com/uploads/1/3/1/6/131606407/mamomovo_gekixinawozeti_bezipepa.pdfIn PDF document text
    • https://ribavazo.weebly.com/uploads/1/3/5/3/135322422/mawufelejolizuxos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412780/normal_603ad6bfc39ba.pdfIn PDF document text
    • https://voxasofipazo.weebly.com/uploads/1/3/1/4/131407247/6607942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fc63b81733fc.pdfIn PDF document text
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/2784617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/loneminovu/wigum.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/nafutefebafasabizasufaz.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/13910761903.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/moto_g7_play_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/rufatu.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/membuat_akun_gmail_baru_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/dunkin_donuts_iced_french_vanilla_latte_nutrition_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/46336429842.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001c09a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C09A 23480 bytes
SHA-256: 22c8568eb4e3a2f5c6001c29e3160c0b3920a3133629b15132fbcf9b8b5184db
font_00_sfnt_off00014391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14391 12228 bytes
SHA-256: 9611e81c6e724fd2896edb5fc8ae23097038b3eacb8256e752793ba74a3a918e
font_01_sfnt_off00016ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADA 5384 bytes
SHA-256: 0c21cb45661267e1ae5b2df9ce044f68c27908db1a2b0d5a48026746445849d4
font_02_sfnt_off00017d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D42 1640 bytes
SHA-256: fddfde5e00583d751ee91213db50b4ddefc600f9d3b9d978be0036e231269fb9
font_03_sfnt_off00018580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18580 21520 bytes
SHA-256: 8153e8b2dfb68e8387c718f2241b4a9ca26506c6b9fc56b1907cc01693d76283