Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf17062d5b6e7245…

MALICIOUS

PDF

88.2 KB Created: 2021-04-05 16:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a450ed8f419f4adf458ceaea789815a3 SHA-1: 74a2d7cb1cc7b2d7304688d7e830d34829e3fc8f SHA-256: cf17062d5b6e7245992b78edf5d3470bb4035ca32d054f6d06892d2033b28492
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URIs that likely lead to phishing or scam content. The primary malicious URL identified is https://mezovuduw.ru/award?keyword=microbial+degradation+of+petroleum+hydrocarbons+pdf, which is likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mezovuduw.ru/award?keyword=microbial+degradation+of+petroleum+hydrocarbons+pdf PDF link annotation
    • http://rafupofamurawaf.mygamesonline.org/vugutomezafivon.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/ifGjhlZ/3200167240.pdfIn PDF document text
    • http://lipazegeboludep.sportsontheweb.net/20895251671.pdfIn PDF document text
    • https://cdn.sqhk.co/kemuxilajig/abia8u6/bugenodif.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/eajigeF/31917525321.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/justine_marquis_de_sade_english.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/jchidjj/motor_sims_2_downloads_folder.pdfIn PDF document text
    • https://cdn.sqhk.co/gefizorabubi/8cYjdqv/free_casino_slots_vegas_world.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/3e8ggNn/my_dolphin_show_2_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/ggtOgju/pokemon_home_mystery_gift.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/hg7gdhd/strategy_pattern_c_codeproject.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuweduti/iaoih5Q/2978433547.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/cdd5e8cf-f560-4849-bbac-faf54af93dd1/linksys_wireless_n_range_extender_n300_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f2d709-1082-403e-9229-eea18dcb94bb/how_to_start_an_essay_about_covid_19.pdfIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_6917f19d480e4a0f912fd117c2716d64.pdf?index=trueIn PDF document text
    • http://misanedajog.myartsonline.com/is_the_uppababy_stroller_worth_the_money.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_26c43926b6334d408eacf05c07d2899b.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_dacc3b34d7f74e1e8920a84037b3f7b3.pdf?index=trueIn PDF document text
    • https://16dc6c2a-32e3-4a69-9eea-5b59d93654f8.filesusr.com/ugd/176c29_f2f25ecfee6e4c54a39ca02f6c0279a2.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_e5814be9eb2247088a15fb8254ccd314.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac468ac-3381-4b22-9447-4743bee21065/how_to_calculate_interest_only_payments_on_a_loan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545ed38c-cb08-480b-86d1-e88b51a59c18/20907257712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b98c0d3-ee5b-41e7-b78c-c7dc9c423608/does_the_miracle_morning_work.pdfIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_99b9467f78da4250b59e9fceec993608.pdf?index=trueIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_c731b7810bcd45e3a6bd41642964554d.pdf?index=trueIn PDF document text
    • http://wojibikifi.myartsonline.com/jadapakopulujafi.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_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 5700 bytes
SHA-256: 090af8c59d55c79ef34bd58a575d53f5660b4dab17a7e9e1d20a63a6c2f16dfc
font_01_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 11144 bytes
SHA-256: f3728daa8f59db2148d632749a0cb0198714101a37da9213601ea29b6cbcd1ef
font_02_sfnt_off00014453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14453 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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