Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bfb7d342288897…

MALICIOUS

PDF

78.5 KB Created: 2021-04-03 11:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 04ebb8051e7afd3b261fea6758576ad7 SHA-1: d7e2e141fb014e08cccf8c77c94ba30b07e7bd1c SHA-256: 87bfb7d342288897cd105daec5105830220546ffbbaad11ebb5596a147ebe7cb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or traffic redirection. The document body, though heavily obfuscated, appears to reference "high cholesterol diet food list pdf" and "wkhtmltopdf", indicating a deceptive lure. The presence of numerous external URLs points towards an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://lozipotod.ru/123?utm_term=high+cholesterol+diet+food+list+pdf PDF link annotation
    • https://selijexobava.weebly.com/uploads/1/3/1/8/131856120/zakujikigilun.pdfIn PDF document text
    • https://cdn.sqhk.co/semubedogi/n6hhgYp/4148850982.pdfIn PDF document text
    • https://dawurawo.weebly.com/uploads/1/3/5/3/135323901/09134d6218.pdfIn PDF document text
    • https://cdn.sqhk.co/junukexad/hidyyA6/10749141405.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/fjeE7ZF/idle_investor_mod_apk_2._1._14.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/TLLhcNL/random_meme_soundboard_chrome_extension.pdfIn PDF document text
    • https://cdn.sqhk.co/jozopotuwomo/hzh4ies/sword_of_xolan_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/iaFkjgg/91271900814.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/hjh5Usc/nrj_smash_hit_2019.pdfIn PDF document text
    • https://karoxenerom.weebly.com/uploads/1/3/0/7/130739074/2317226.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/fo8lhj0/xuganeki.pdfIn PDF document text
    • http://kihepc.xyz/us_army_sniper_shooter_mod_apkppmi8.pdfIn PDF document text
    • http://jasapremium.xyz/660381732661nvqi.pdfIn PDF document text
    • http://itdiscount.info/the_beginners_guide_to_crochetyfz9b.pdfIn PDF document text
    • http://hushseo.online/harley_davidson_service_manual_free65910.pdfIn PDF document text
    • http://fbcopyright-center.com/69911098765hof4f.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/cijUgcw/best_new_york_times_crossword_book.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/97a8ace6-332d-4285-abd5-4a310b57dbaf/luxubano.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_57964adad23e4b6e9f6da899c0aa5aa7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8eb51a-f606-4bbf-bf5f-80775515b7f0/95918688322.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_4161365b3c25404aaef15c40b25ede72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7187a91b-8fb2-4d06-b9c9-4567262fd382/69839490983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3563388f-3216-4821-aa1d-c181635ced39/jasunexozadasiwe.pdfIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_891f69c695544e6981c7a3c6d947487a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7cb4eb-ced1-48d1-aa18-476b96605953/zivifuzuxiverum.pdfIn PDF document text
    • https://0f424234-9c27-4462-a606-4b2ccecf17d8.filesusr.com/ugd/b42a09_d62bb98db9ca4cdd948c710a8ee5402b.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_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 5168 bytes
SHA-256: 90e7a934beed48c804a41e6c81362d6ebecabefc34ccda2a5d37d988df297064
font_01_sfnt_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 10816 bytes
SHA-256: 569050efecfb1457f2ce70eebe0879e9da1e2bba9be8bcdf5a3b51d075bd3511

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