Malicious PDF — malware analysis report

Static analysis result for SHA-256 773f1ea0f7a95649…

MALICIOUS

PDF

83.5 KB Created: 2021-03-22 14:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16118655bd9dcf408fe8fa1ebb05d7aa SHA-1: 938a2da084690a7ae5558b534522e9994f3c64a3 SHA-256: 773f1ea0f7a956492a9053cb9f10c64b5e8af503b3bbcdf8c402bbeee88f2a6e
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 0.9990

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://baarspo.ru/strik?utm_term=filosof%25C3%25ADa+del+derecho+resumen+uba PDF link annotation
    • https://nupowanekajotut.weebly.com/uploads/1/3/0/8/130815303/00a09747a2d.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/classifying_triangles_game.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/pioneer_avic-5000nex_map_update.pdfIn PDF document text
    • https://babunugigexi.weebly.com/uploads/1/3/4/5/134582988/15e03e79778afc.pdfIn PDF document text
    • http://a-trvl.ru/87319848863ttn94.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/69226433045.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/LbgjgcD/business_joint_venture_agreement.pdfIn PDF document text
    • https://kerozutovazo.weebly.com/uploads/1/3/0/8/130813796/zuwodalese.pdfIn PDF document text
    • https://cdn.sqhk.co/guxifunuris/drxijgb/heritage_auctions_nyc_office.pdfIn PDF document text
    • http://profer-opt.ru/neweto7v2bf.pdfIn PDF document text
    • http://pazolozul.mypressonline.com/12th_botany_notes.pdfIn PDF document text
    • http://uscreditscore.info/jelagujusututisofuvorrcxsp.pdfIn PDF document text
    • http://yoga-fitness.space/zejokamesololelegya52k.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/harry_potter_book_2_chapter_6_summary.pdfIn PDF document text
    • http://prizinsta.online/vofudiwhdmxq.pdfIn PDF document text
    • https://dinowupeguf.weebly.com/uploads/1/3/1/3/131379410/sulup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/arya_movie_song_masstamilan.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_ff1c12c71188419c8df1b9b0164087c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zowejunef/animal_farm_movie.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_81c7aab675b34dfea68271290f0de7ae.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_b06cb6148eea4f45a42e57f8d340e224.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_4560322b16614d40afbe646d4dd5fa76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosawef/696659681.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/what_do_you_do_at_a_red_light_go_joke.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/bhldn_jumpsuit_wedding_dress.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 5408 bytes
SHA-256: 2b2f2bf681b4ecd074ec283a9245be5e073c89600ee062f57e3f1cfc405847df
font_01_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 11356 bytes
SHA-256: 07787157c030e19ce3449baa7da201813858ee4e7370095577e6ba1fc3d03fd7
font_02_sfnt_off000128ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CA 16192 bytes
SHA-256: a593905bf74b2c1a089f55414b68c7a0efdbde8d30de310fee0b84330233135f