Malicious PDF — malware analysis report

Static analysis result for SHA-256 77eaa7b349871b13…

MALICIOUS

PDF

122.8 KB Created: 2021-06-07 13:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 931294f7e4f2418fe76bc91313612caf SHA-1: d86d0840dd1a2f1d4b4ae89a632588b5422ddd42 SHA-256: 77eaa7b349871b13d32a0dd45648fed0206fd320cca3acddce10ac4f3c0ef898
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, including one pointing to 'garglob.ru', suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be junk data, reinforcing the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9180

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 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
  • 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://garglob.ru/pbw?utm_term=how+can+embryonic+development+be+used+as+evidence+for+evolution+apex PDF link annotation
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/kikuvofus_nivoluxutimoja_zakisidaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484358/normal_6016db3a5f196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_60baa1c6b3dab.pdfIn PDF document text
    • https://derakudo.weebly.com/uploads/1/3/4/2/134266069/tozadunolipedisu.pdfIn PDF document text
    • https://jomopejizudo.weebly.com/uploads/1/3/4/6/134664487/70f1382cbd9.pdfIn PDF document text
    • https://mukojemugasab.weebly.com/uploads/1/3/5/3/135314074/tafosusasikerugodap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479451/normal_6039ecbb6e498.pdfIn PDF document text
    • https://kebekeloku.weebly.com/uploads/1/3/4/6/134639455/welividukowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozixokumo.pbworks.com/w/file/fetch/144434235/tips_on_how_to_write_a_metaphor_poem.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/49060556221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e3cecb-3537-4027-9dfe-10e96394b80f/7195126187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ae7c48-7611-4001-97c9-2c8f09763719/oh_say_can_you_say_dr_seuss_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f0517f-e424-4b2c-8951-e1767db1e0fb/dokikaripum.pdfIn PDF document text
    • http://kalozewura.pbworks.com/f/how_to_build_marshmallow_and_spaghetti_tower.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144534351/what_is_romantic_realism.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/w/file/fetch/144707850/exemple_memoire_bts_dietetique.pdfIn PDF document text
    • http://mituxap.pbworks.com/f/rimopojejigiwuxok.pdfIn PDF document text
    • http://zumejukikug.pbworks.com/w/file/fetch/144701970/what_is_minority_report_based_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5aa7c87-a2c4-4a29-a83e-1788e9d96c1a/law_for_dummies_john_ventura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1489f4-9758-4b01-b9de-1952534c783f/96979915725.pdfIn PDF document text
    • http://fixulirulafa.pbworks.com/f/csr8510_a10_driver_windows_7_32.pdfIn 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_off0001a3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3E1 5724 bytes
SHA-256: 995c27f0d7d079456518c046a5e79cb7d97b659d4bd84e7aceaa8bb3b1ee1584
font_01_sfnt_off0001b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B75A 11520 bytes
SHA-256: 1b2703a9f33b06a5d1d4dcf350dd44d9328f07e6c62b4914cbbe4ebcf6426474

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