Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f08d9b82cd457f…

MALICIOUS

PDF

77.8 KB Created: 2021-05-28 19:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e8e590359f48070a5a04476a44dfa0c5 SHA-1: 2a0a7f39bde9a1c49534337c0fbcf31726d0bd0b SHA-256: 04f08d9b82cd457f5a817f75ca4b08f4a56a6e39265a49e7c56c7d08809e35e2
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 0.9996

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://nipisod.ru/123?utm_term=aga+khan+university+admission+form PDF link annotation
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/kugavemalenixuj_falekim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_6066937346c60.pdfIn PDF document text
    • https://bimexojagof.weebly.com/uploads/1/3/4/6/134655387/9fe5d7363c3.pdfIn PDF document text
    • https://jiziweradufib.weebly.com/uploads/1/3/4/8/134847172/zexivulusuredutusi.pdfIn PDF document text
    • https://sanakifagijegu.weebly.com/uploads/1/3/4/4/134404207/jurolipojixo.pdfIn PDF document text
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/sarukuna.pdfIn PDF document text
    • https://xifofenanupov.weebly.com/uploads/1/3/4/8/134857182/puxura-bitojomanigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489993/normal_6061b16717264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_603fd855a1a4b.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/8281819.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/lenimunowukigaje.pdfIn PDF document text
    • https://pawuxadatunu.weebly.com/uploads/1/3/4/2/134266652/3489079.pdfIn PDF document text
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/zaxanisiweguk.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://uploads.strikinglycdn.com/files/a54f0cd2-09f1-4291-8349-54c503232516/44191696826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00644ab-7a1e-44b5-9ecc-95289bd16c89/70958870119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa8e948-f21a-4f53-a433-1d6483dab02d/70045922153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1983533-848d-4cdc-b893-72e3d2c19224/tiratusiduwewusowubidagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b29eabe9-d5f5-4b65-8c45-eba84a0e7e58/functional_training_workout_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3a82de-888a-4b1b-8a9a-cc438db80a3e/nejipaweruje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f608344-e2b2-45c9-9797-7144986f817c/fevole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a668b36-864e-40f1-bafd-0468f1953e73/43906511904.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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 5388 bytes
SHA-256: eb027a849417b012725299b29afdf0b2308c5f3070d0f7f28b05ca2582cce107
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 11300 bytes
SHA-256: 38210d5c613754dd86b74eb4a9778e589e9d669989a91c84c75915596ad02be4
font_02_sfnt_off00011a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2