Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4c68fbb041ab8e…

MALICIOUS

PDF

87.6 KB Created: 2021-04-14 15:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 639bf484a130fc56132951f1abdf7398 SHA-1: 2ec146d605f040f125ae61a7d36eaf0e47d858fa SHA-256: 7a4c68fbb041ab8edbd673582fc5b36330241014f76fed780a66aade09c30ff1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9989

Heuristics 5

  • 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 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=spd+sx+wave+manager+windows+10 PDF link annotation
    • http://alifan.store/harry_potter_5th_book_reviewgv6hb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_6064dd45f2814.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/rolukopusegezefosa.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/92054755096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_6019262676f08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_6034dcf699deb.pdfIn PDF document text
    • http://voztrans.ru/benyamin_aadujeevithamyzyqf.pdfIn PDF document text
    • http://streichpack.online/6253078273zkuq0.pdfIn PDF document text
    • http://fastpysystem.online/47043954798772jo.pdfIn PDF document text
    • http://reawolt.online/70288782907iyi4w.pdfIn PDF document text
    • http://rojibitakuvekuw.scienceontheweb.net/edema_pulmonar_radiografia.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://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_388ba4baba584796a2237092e0754164.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesijesule/wheres_my_dc_tax_refund.pdfIn PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_936954d83b804011befc370468a4d25c.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_b3cedbe3f6a449d5a9d8234931da0e9a.pdf?index=trueIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/jabenebijezizaxapi.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/whats_the_healthiest_thing_to_eat_at_dunkin_donuts.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/do_long_haired_dachshunds_shed_hair.pdfIn PDF document text
    • http://didaledagaxuz.rf.gd/53543622930.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/statistics_and_probability_letters_latex_template.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_dcea497156db40419b1fe720ff53b16e.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_dad37d9e3f22477792d32c6d56c5760b.pdf?index=trueIn PDF document text
    • http://zitejilid.epizy.com/tikemipidu.pdfIn PDF document text
    • http://pasezuj.rf.gd/71102548075.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_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 5472 bytes
SHA-256: 30af1db50f4d624d7f39bfade4b262f1314d1cc9c3d6a9b17feb00c0cb70e151
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 11432 bytes
SHA-256: 30661b88191fa057731833e31f64aee84487f71aa93462366b4e0f166783f105
font_02_sfnt_off00014264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14264 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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