Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5d264579643888…

MALICIOUS

PDF

78.6 KB Created: 2021-05-30 04:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5ee34be330bb5d64d59957c3621c77f2 SHA-1: 272588eb114b2f062a3122806f537c34b3b69eca SHA-256: 5c5d264579643888daf35f24a6d5f2a5506dedcf42f62ad92c82acb892eb84fd
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain ('golowaki.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://golowaki.ru/strik?utm_term=la+teor%25C3%25ADa+del+aprendizaje+social+de+albert+bandura+interacci%25C3%25B3n+y+aprendizaje+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6009c6fcdcda7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_60120a370b21f.pdfIn PDF document text
    • https://webojugobe.weebly.com/uploads/1/3/4/6/134601542/diwabalubinadeb.pdfIn PDF document text
    • https://megimopitujoni.weebly.com/uploads/1/3/4/6/134681749/gefaveg.pdfIn PDF document text
    • https://jutineriru.weebly.com/uploads/1/3/4/8/134866815/betixa.pdfIn PDF document text
    • https://suwuvonujijipi.weebly.com/uploads/1/3/4/0/134042364/517380.pdfIn PDF document text
    • https://vifedunujaxali.weebly.com/uploads/1/3/4/3/134398483/ratetixibinonap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_606a9819c31d6.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/c055b842456b8b7.pdfIn PDF document text
    • https://kadexatazi.weebly.com/uploads/1/3/4/6/134648676/kepizezabupos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417648/normal_60000e8891751.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd01061a-9f3d-41cd-b018-7d9c5d603769/ooma_linx_wireless_phone_jack_for_ooma_telo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e91273a-be02-4ca0-a08e-a4f83b670d66/dufenedipisatabagijab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e460d157-a1b7-4090-8517-6906288e0416/kofukafinibatetaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9dd48b8-931a-4c86-a76b-6e4a92f427c1/25320629822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f73b12-7715-413f-a7ba-91996bea1dec/loxegos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2654675b-b9a3-428b-9348-f50991f4a7a7/mr.children_another_story_lyrics.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_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 5648 bytes
SHA-256: f20e619abd1d007f3b954e683dcff66447881798978a347d5558bdcde26b66b5
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 11572 bytes
SHA-256: a7956472c430690d2f04067ef61c9393d5bcf2800b2f04646763f6903e68ad4e

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