Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ed83f8435833b7…

MALICIOUS

PDF

78.1 KB Created: 2021-04-13 18:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e397902bf30ce3661ca35f0df8f00541 SHA-1: 4f85a6f595381dad3c376930cccdec3bb261d904 SHA-256: d2ed83f8435833b72d858430a8167ea5cd0d1435ce7eff5e41149699044322f8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://xajibur.ru/strik?utm_term=english+articles+for+beginners+exercises+online PDF link annotation
    • http://jidudilubad.mygamesonline.org/11139272612.pdfIn PDF document text
    • https://merusomewazotom.weebly.com/uploads/1/3/4/5/134514041/zogobixubigijotos.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/2013_dodge_charger_rt_for_sale_in_texas.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/dagorafupobe.pdfIn PDF document text
    • https://lexodedibipi.weebly.com/uploads/1/3/4/6/134683920/a22c77a13.pdfIn PDF document text
    • http://hempmap.ru/72381042440ent02.pdfIn PDF document text
    • http://jidudilubad.mygamesonline.org/8001884574.pdfIn PDF document text
    • http://basvuruizleme.online/teri_ankho_ka_kajal_dj_song48kp3.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/problem_statement_thesis.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/jerkmjb/break_down_the_walls_lyrics_asking_alexandria.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/id7hgDr/photo_editor_collage_maker_pro_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/qshdgg9/cnc_pilot_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/bosavoked/dibhdie/15019905497.pdfIn PDF document text
    • https://zopiwaseka.weebly.com/uploads/1/3/0/9/130969839/kezirivixaz_ditaputemixadul.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://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_d2fa8020249f4432844a85e6dda36134.pdf?index=trueIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_ab5cdfcf17ee48888006d89947594f62.pdf?index=trueIn PDF document text
    • http://zilowovuv.atwebpages.com/magic_chef_mcsdry1s_2.6_cubic-ft_compact_dryer.pdfIn PDF document text
    • http://vuzuwukef.atwebpages.com/24361329251.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_7423a047b27d4544a758a0a06ece3a96.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_0c000c6851994befb7f33a62eaa0bc04.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 5096 bytes
SHA-256: 969bd55558d0a86d35de7fd0443796fdd1d1744d27098173ce6d141e7106f6db
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 10260 bytes
SHA-256: 74efc1dfa42aab553c81a8669e1a82513f6660f517ee288d67b141fad3fe0093
font_02_sfnt_off00011a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176