Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaca58c76ddeaaf…

MALICIOUS

PDF

78.6 KB Created: 2021-04-29 15:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 16954b04fac62b7c1df812bcd7bcbcf6 SHA-1: cc53744bcf2ced2b4ed6902f689223c010419cb1 SHA-256: bcaca58c76ddeaafb36a4664a65a30b4d93369ddef5ab996935ad3ba46d1ff7d
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a tactic of using a seemingly legitimate document to drive traffic to attacker-controlled sites.

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://jacksth.ru/strik?utm_term=time+management+techniques+for+sales+professionals PDF link annotation
    • https://cdn.sqhk.co/wanukawuwota/dhhAifx/photos_apple_tv_app_samsung.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_6012a43c40a52.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/OWMSEhf/shark_ion_robot_r76.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/9Nij5Xy/carnival_clown_toss_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwametin/mIhiMih/mabupinenopado.pdfIn PDF document text
    • https://cdn.sqhk.co/sugojipo/ejFihXD/jurassic_world_facts_app_all_codes.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/21769276043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_601fbaa4446be.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuzadisup/heyrCVs/zenavosuka.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/bgcd8jT/22651314451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5fca17eb921ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_6062fe7a23ec9.pdfIn PDF document text
    • http://kitazixozakabu.sportsontheweb.net/how_to_find_initial_y_velocity.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/4831651357.pdfIn PDF document text
    • http://lerumedinopox.onlinewebshop.net/vapunened.pdfIn PDF document text
    • http://wefalumulupubu.epizy.com/wolf_fursuit_head_template.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_1f99f9e2700b466fb514d9cbf305e879.pdf?index=trueIn PDF document text
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_34cb710e9ee14791bedbfefc04303d7c.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_fa7bea82fc184a0ca0973a5981725494.pdf?index=trueIn PDF document text
    • http://burerekel.rf.gd/halo_reach_computer.pdfIn PDF document text
    • http://kopolug.myartsonline.com/english_phrases_for_dummies.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 5504 bytes
SHA-256: 169660fe01416d510580864b8dcf1e338612f2e4e4f4ef3f1ef47bb657ea6ace
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 11188 bytes
SHA-256: 9c24d4a30502d2c910fa2aa359114bd4158f0ab3346cfa0f8f9af86cab8db465