Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5b7e3652222a1a…

MALICIOUS

PDF

71.1 KB Created: 2021-03-30 04:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3863d751413f6d7240184d8b29aacb22 SHA-1: e4ceb38651a427a675573ccd378d019f925a9deb SHA-256: bc5b7e3652222a1a1a8d669225cd1166481b0feb3b10eebc388568c70a90951a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, and the presence of embedded URLs supports this. No scripts were extracted, but the overall structure points to a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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/aws?utm_term=bissell+cleanview+pet+rewind+parts
    • https://cdn-cms.f-static.net/uploads/4421966/normal_600c102cedffd.pdf
    • https://cdn.sqhk.co/sanobude/Xw7njbZ/cure_hunters_apk_mod.pdf
    • https://jazemajotejavux.weebly.com/uploads/1/3/2/6/132681398/4d7290dbd83a9.pdf
    • https://cdn.sqhk.co/kagalitisup/2ihgjii/29389960578.pdf
    • https://cdn.sqhk.co/nobuwinulad/in9Ukyu/caster_sugar_nutritional_information_per_100g.pdf
    • https://movobukibajub.weebly.com/uploads/1/3/4/5/134597216/0cf4d.pdf
    • https://cdn.sqhk.co/wexifidobafo/5ugjvgh/hockey_statistics_app.pdf
    • https://vomanoxugorufo.weebly.com/uploads/1/3/5/3/135331351/0ee7a1940fc3.pdf
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/9654565.pdf
    • https://cdn-cms.f-static.net/uploads/4392864/normal_60543cde7d08e.pdf
    • https://cdn.sqhk.co/kovajivika/i6mhgKg/11534621047.pdf
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/6080093.pdf
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/8598109.pdf
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/6474426.pdf
    • https://jorikumovitakus.weebly.com/uploads/1/3/4/8/134883246/6d5c68c9bc17d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xijewixevav.onlinewebshop.net/do_you_have_to_read_the_how_to_train_your_dragon_books_in_order.pdf
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_e5113300e8164858acab988133864753.pdf?index=true
    • http://zewadomi.myartsonline.com/99473972128.pdf
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_86a200c4daf24d15a60fe4afba6620a7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88c.bin
3463bda61de7b7e918e943f5c1199edb537d66e7ff691123af401ea4667bb82b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 5268 bytes
font_01_sfnt_off0000ea9f.bin
801cb2cffe08dacc2aae9c9c755827e7725bea46a76d059781e47772f54159dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 10140 bytes

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