Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf388352941c920…

MALICIOUS

PDF

71.3 KB Created: 2021-03-09 21:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7bca78ec85bb141c8a82e10ff3002e97 SHA-1: ddedd20df34e865d87ffee4828c969db0ff2c95d SHA-256: cdf388352941c920e3e7a2f91495acc2b31270e611609670df197e655dbd0e4e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=simplifying+polynomial+expressions+worksheet PDF link annotation
    • https://dumaxenuwumav.weebly.com/uploads/1/3/3/9/133997891/luxarakigemawilo.pdfIn PDF document text
    • http://pearhaidhr.fun/7482458193nb278.pdfIn PDF document text
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/goluni_vivix_titiset_tuzogabejutej.pdfIn PDF document text
    • http://bufo.online/bubapuleguworibogw7rz.pdfIn PDF document text
    • http://beamorem.com/tristram_shandy_critical_analysistqoig.pdfIn PDF document text
    • https://limopepubev.weebly.com/uploads/1/3/4/6/134627214/2eb7bf.pdfIn PDF document text
    • http://znohist.site/pomiruzofigewusedezajrq2.pdfIn PDF document text
    • https://notozovurex.weebly.com/uploads/1/3/2/8/132814393/1716587.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/xidgdnH/wonozigixanavu.pdfIn PDF document text
    • https://cdn.sqhk.co/ropulufira/deFgjMU/yeezy_350_v2_bred_restock_2020.pdfIn PDF document text
    • http://kvyovk.xyz/merlin_season_5_torrentmn9mz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_e6bded7577e7425381b6ac93b2a47383.pdf?index=trueIn PDF document text
    • http://vogidefoxafubis.epizy.com/how_s_life_going_answer.pdfIn PDF document text
    • http://fobiwuna.epizy.com/tokyo_ghoul_mask_designs.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_8ecfab3cd3ca4e4397063ae8f85c2f7b.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_f970f14606c04b0c969a66e53b692907.pdf?index=trueIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_cda73aa26b30476ba979f5c4d094758b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 5744 bytes
SHA-256: 4e614b2f96dfb3e66a59906a7d973e33d649d7ec7ddefd246b6c1ec49c5f0578
font_01_sfnt_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 10716 bytes
SHA-256: ed2922ff21f9292d4bb7aaa85ac9171424433c898516eaf91f175572719825d3

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