Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4f7e5ad4d18da8…

MALICIOUS

PDF

84.2 KB Created: 2021-02-25 21:12:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0009605b2a3bc9baec83cfebce583341 SHA-1: f4d8fa3c5c0dce79b7662142d33b1a29a4efa1b9 SHA-256: 7d4f7e5ad4d18da870f36080aa3ecf2a3688f7750dbad90a5c33e90c9f30490c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest a link farm designed to redirect users to potentially harmful content, disguised as a tutorial download. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is used to facilitate the download of a second-stage payload.

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://jottigo.ru/wb?keyword=autocad%20electrical%202010%20tutorial%20pdf%20free%20download PDF link annotation
    • https://mefiwoteta.weebly.com/uploads/1/3/5/9/135956645/9535157.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/43411230416.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/dironugudana.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/dapaxofuzemubaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_600e38aa8b8ad.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/397f1cfb04ad.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/casio_fx-9860gii_sd_price_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/UgfhfNp/l-_lingo_learn_thailand.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/zezelijiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_60158365dee8f.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/temojidelavaki.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/fakemusesopakekigodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/godewumazek/86481430956.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/ielts_speaking_topics_with_answers_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/34852017035.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_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 5376 bytes
SHA-256: 45cb82221f14cc970d4e8407bb980b9b3a151b9b88f6b4b40897da92f8ef7ace
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 12088 bytes
SHA-256: 164f96c8efe92bcbdfef9228e96f38cdf80849b1a758d5bcf5b1dce63f4058c2

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