Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a8cb3aa1d0225b…

MALICIOUS

PDF

89.5 KB Created: 2021-03-22 05:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ff1e1202dcef3d59703678b7d57999a9 SHA-1: 5b46a78f69391bf771498378afc2180e09b0ef75 SHA-256: 89a8cb3aa1d0225b6f186331cc4bbf032d135d8c5ae0f02aeb33ab5c23bb71e1
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 0.9995

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/wix?keyword=snapchat+phantom+apk PDF link annotation
    • https://penugevofubelig.weebly.com/uploads/1/3/1/1/131164238/c479215a84.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/dYds3ij/feisty_greek_norwood_phone_number.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/xiwiluj.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/rafuduxagevu-gariva-vedagu.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/3271748.pdfIn PDF document text
    • https://sofusosixep.weebly.com/uploads/1/3/4/4/134493363/48d64e7eebe33d5.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumabigige/ha5ynif/cowboy_bebop_spike_cosplay.pdfIn PDF document text
    • https://babobulelemin.weebly.com/uploads/1/3/5/3/135344535/tilozowanowilusen.pdfIn PDF document text
    • https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/4991839.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/13960329fd6c70.pdfIn PDF document text
    • https://givetowa.weebly.com/uploads/1/3/1/4/131437183/xarufedaroraxu.pdfIn PDF document text
    • https://penotogales.weebly.com/uploads/1/3/1/4/131438478/pumigavelur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_f60a5214737d404b90fa4b9744635206.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_3de1bc579181493e81a051e815b39413.pdf?index=trueIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_74842abe2e8343dfb224e948849d1c0f.pdf?index=trueIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_e447b9070f3f495593c8396521989645.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_de5a749859704c6380b13ba28b6c927d.pdf?index=trueIn PDF document text
    • https://ca06489b-9cc7-4d60-8424-05bb9d91883a.filesusr.com/ugd/35b1aa_763a35724cb14818b19cc301afabae8a.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_4e0ebeedaada4bd7ab6476bd2c55e577.pdf?index=trueIn PDF document text
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_d64bfb169993427893859c91d8203827.pdf?index=trueIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_a6d848d04f3f4ea7a9a931bd738e56fb.pdf?index=trueIn 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_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 5036 bytes
SHA-256: da4074ceb5ba2cd1dffda20f868876edf4cc3d672a4ecd041e9ebddab5342236
font_01_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 13180 bytes
SHA-256: c7f7c0a7af271ca8a90000cc8e375a11068fe257c6f66a1f679faf9cd0c01d35
font_02_sfnt_off0001438f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438F 16060 bytes
SHA-256: 4471f92216f50ed59660dfde07325d7bc7936b356a877ae20405b399f7876638