Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08392238db155fe…

MALICIOUS

PDF

78.8 KB Created: 2021-04-17 00:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a59880b6d7025788cb3014b08d0dcc46 SHA-1: 21ab7baca6873cfc9006127cb45d4935b76420f2 SHA-256: c08392238db155feed68eaf8d28626f346aa5617895ba248f9662917ca035469
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of ClamAV detection and ML classification as malicious further supports this. The document body, though heavily obfuscated, contains references to academic materials, likely a lure to disguise the malicious intent of redirecting users to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=exploring+chemical+analysis+5th+edition+solutions+pdf PDF link annotation
    • https://riligisivimi.weebly.com/uploads/1/3/5/9/135992895/c17b76.pdfIn PDF document text
    • http://trastenmyqort.online/writing_effective_sentences_test_quizletwp4td.pdfIn PDF document text
    • https://luwidejike.weebly.com/uploads/1/3/4/8/134881341/videg.pdfIn PDF document text
    • http://forkidsshop.online/69297830629clds9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_60327d5c21bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_601bcc1465c2f.pdfIn PDF document text
    • http://idealica-italy.site/cisco_linksys_e1200_username_and_password57hpz.pdfIn PDF document text
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/4640709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446638/normal_604eeff963d3d.pdfIn PDF document text
    • https://kawuruli.weebly.com/uploads/1/3/0/8/130814241/bopumureda.pdfIn PDF document text
    • https://vogunuwar.weebly.com/uploads/1/3/4/8/134887333/b931b1626e.pdfIn PDF document text
    • http://citruss.space/428308245151yi54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405185/normal_5fe200c491b6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487663/normal_601b936490b7d.pdfIn PDF document text
    • http://boost-store.net/wipodexijunilu0iq0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_8e011c49133f4486813d11d5c9a914f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/883c81dd-8396-4edf-a5fb-b7ef0a4518f2/moultrie_game_camera_forgot_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9633b8-ec71-45e1-b648-04df2db717dd/69128304857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6033b9bc-c3f9-47b7-a5b0-548a5255ab23/how_to_operate_self_cleaning_ge_oven.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_6b3083ad03b348c28f87503be887d81d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc0d8bb-7b25-41a3-a67b-e79b964a38e6/darigelokovogoru.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 5820 bytes
SHA-256: 7aac2b832faee72e9fb08a963c031749d8f791371267e120d5be96f4c36899c9
font_01_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 12068 bytes
SHA-256: 39bcc6eb83b08fd332ebaddd14ce802d0550477abf49e90a0247bab840feb21c