Malicious PDF — malware analysis report

Static analysis result for SHA-256 273bd64732584e3e…

MALICIOUS

PDF

79.5 KB Created: 2021-03-15 02:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a6b6f39f7cd19e984642c9d57142db21 SHA-1: 1e7a2e0061356d619d99db2914bff6c2cd7a8e68 SHA-256: 273bd64732584e3ea05594a753e2dcf576d4cf1c516a4d8ea816f5e30d921b80
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 0.9991

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=construction+cost+handbook+philippines+2018+pdf PDF link annotation
    • http://peteferix.mypressonline.com/how_many_decibels_is_a_dishwasher.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://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_df871aef2ce74a10962f2c02d4ac905a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/bayern_mnchen_logo.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_f443383feae140f487edbb9b0aa8452d.pdf?index=trueIn PDF document text
    • http://koxolavomuzo.myartsonline.com/bofaxososazomo.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/gusawumakevexugukulotojuw.pdfIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_bcbea084ab504c2792830a6d8c70aed5.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_85e505f2897044b989e061268de245aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/82994827527.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/the_ascent_of_money_summary_chapter_6.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/renepolixiwubididojigu.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_d6927f3520e1486daa53910df412204d.pdf?index=trueIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_2e5b18aba8484e1299c9f37c7ed979e3.pdf?index=trueIn PDF document text
    • http://sodowurivav.onlinewebshop.net/yellow_coldplay_guitar.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_51edaae172b9432e86b383eb0259f413.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_336d4d9ab8524615aa9fc8af9036a4a2.pdf?index=trueIn PDF document text
    • http://nofolimuri.myartsonline.com/famomolugu.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_a9a2b22bcd7e4e91aefb3e0636d5ae3d.pdf?index=trueIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_f59729c6c4b14ddf9f9d932c7d2c01b0.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_4d4fcdc379974e53bc0f5d460ead7efc.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_b6f4f37dec7140aabed279077aca477d.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_1c5c4b6347154e07bb2c3186a3ba4a21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/10404310604.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_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 5872 bytes
SHA-256: 040bde458ff043348a98ce33b05e92477ae73fdb39a2713911416b5136504bdb
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 10820 bytes
SHA-256: ca490ded19fcb4668a569afe20b787824a4490e2f1bd10e28da417d9e3c05d8a
font_02_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378