Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c410c81ae9ab72…

MALICIOUS

PDF

64.7 KB Created: 2021-06-01 15:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fad1800520cfda226b3cd1cfe4e51bfe SHA-1: b0277c486228e5728df261e18431f5c37677f005 SHA-256: f7c410c81ae9ab726774d4a70b7b743f80e9b35312f511d90bbbbee50a991ada
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to disposable or link farm hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to medical tests, likely serving as a lure.

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://huntic.ru/pbw?utm_term=dexamethasone+suppression+test+interpretation PDF link annotation
    • https://ludexibof.weebly.com/uploads/1/3/4/6/134638297/6904476.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501057/normal_5fde6b0ddf333.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/nawuw_lukekep_binegojiz_vinila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_5fd7c1d074594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_604d1f378850a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_60563ca3a5ff9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144419145/suvarudezi.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/51320434886.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/w/file/fetch/144418581/what_can_i_say_to_my_niece_on_her_birthday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1d7347-d5be-4091-94e7-e79ff5f004d6/17823115158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5570717-eec2-4739-9e68-a8b4a894b2f5/starting_new_life_love_quotes.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/12735895612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72172a89-1955-4854-97aa-69608a7832e6/jetuvoju.pdfIn PDF document text
    • http://zewalar.pbworks.com/w/file/fetch/144454548/1885926395.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/33619255508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b010d2d8-24ea-44e0-ab94-2862aaaab518/43963357657.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144444552/bloons_td_5_free_ios.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_off0000c30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30A 5092 bytes
SHA-256: 032c2e2d1dc008d129bb5d33db52ac95937a70dec4cda126f45921172a56f706
font_01_sfnt_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 9848 bytes
SHA-256: 61d572147439322f88da3460da627a0467db0c1ba927ac69a0c20ae2c0ea32cf

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