Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc043b39b8799e5c…

MALICIOUS

PDF

74.9 KB Created: 2021-05-05 19:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 097c209e3ed73176e49744c48a0608f8 SHA-1: 1493145331791bb7f7a93ad847aed1cb1434fa73 SHA-256: bc043b39b8799e5cc1a1893b05bb6217392c322cc8db84444914baded1538419
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 0.9998

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://dafemum.ru/strik?utm_term=polycom+soundstation2+ip+mode PDF link annotation
    • http://wovuwukotuvoxi.mygamesonline.org/princeton_review_act_practice_test.pdfIn PDF document text
    • http://zowogusatutojus.mywebcommunity.org/girezaxejakamut.pdfIn PDF document text
    • https://fuvimufuba.weebly.com/uploads/1/3/4/8/134870364/lepevobajobor_potefema_puniritonuw_xosaje.pdfIn PDF document text
    • https://butiriretife.weebly.com/uploads/1/3/2/6/132681404/325aa9c51dfb1c.pdfIn PDF document text
    • https://vukibipodut.weebly.com/uploads/1/3/4/6/134690361/sovugu-jugixinumo-nowitisuz-gatupe.pdfIn PDF document text
    • http://tarezirok.mypressonline.com/cch_chuyn_t_sang_hnh_nh.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/b58e3ab1-cc8d-43fc-a52c-47d7c43cc236/pusoxodax.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_884f14357432451798270863b4474c6d.pdf?index=trueIn PDF document text
    • http://bilelixolivip.rf.gd/32813920034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a2a02bc-b580-40f6-ac99-8d4e8fbc1478/lewemimutunikasegadu.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_237ef7d2c74b4ec2acc7ffa3d3d8641f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6137fb87-7c32-45f8-9ef6-12d5a1dee35d/feweruxabomonak.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_fa039bae1b69442685804eec49e6b8cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d91c82-1148-4d63-ac44-3fde90f2aae4/all_the_missing_girls.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/34097966993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae2e469-ac05-4295-ae9a-0e5a56f1e526/sivugejad.pdfIn PDF document text
    • http://sububadanevabu.epizy.com/baby_girl_black_dress_3-6_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edffc42e-fdd8-4fff-bd21-e3a9094eee98/how_do_i_cancel_my_planet_fitness_membership_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9eb4e0-d439-4521-b817-7698f0f173aa/18416641440.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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 5240 bytes
SHA-256: 781c3d8d37e91a9db0421cd3b89d1aa5106bc09ac04f3c4a4d7df7e3db8b5191
font_01_sfnt_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 12024 bytes
SHA-256: 143b882c20ca2946bf23e3e182ba69ce5adacb238caeba8ce283c2a45956d29a
font_02_sfnt_off0001105b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71