Malicious PDF — malware analysis report

Static analysis result for SHA-256 8807bf586ee051e2…

MALICIOUS

PDF

79.0 KB Created: 2021-05-30 21:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f7ef198abaca938f61f4a8d1b7721fff SHA-1: c09e00f8373843d394643bc2bf82d80c32a2fb9c SHA-256: 8807bf586ee051e2440f5d44529fbad6aaa7f049fe3a18cf8c75b837ecef59be
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a redirector hosted on 'dafemum.ru'. This infrastructure is associated with phishing and SEO link farms, suggesting an attempt to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dafemum.ru/strik?utm_term=summary+of+houseboy+by+ferdinand+oyono+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4453730/normal_6001f661c7650.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/rujujapusanilad-fibixupo-jimokonorap-xogedevobasemud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458838/normal_5fc98c16bd5fa.pdfIn PDF document text
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/1f10e0d60a3c9.pdfIn PDF document text
    • https://xojurumute.weebly.com/uploads/1/3/5/3/135328527/popugitabavaxotobuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454425/normal_604d1b0ebbf83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_6067ce133a85a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_600e3c51ada5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_605a24f4321f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_6015a50f66ffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_605f360a0df2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476941/normal_6023c65b240bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_60166d7396c04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/033a5e82-b3b8-491b-826a-cc2ee84fcc70/kemixemuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc07d3c8-bf4a-4d74-99c0-04da78aed726/78520958204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc10784b-7561-48c0-8bb3-5f912702bc3a/wosepupowazejudidekajusif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128e512e-316a-4454-a354-b2d882ab5cd0/98669835022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a92cb2-835d-44a3-8a04-a6f2382aab15/45123393565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6672d78a-cbd7-4d86-961a-85ae52e14f95/what_are_the_types_of_plots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9273938-b785-409a-ae3d-ae8341d87ba4/1758079320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2818b23-d601-4e4e-982a-aaac5008169f/zubunesegimopezejino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d12be7-bc77-4b35-a6ae-3aa78b5cf76d/59154923377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33802f18-c666-4571-8efa-4dae49613921/61677243997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c87bafe9-6c89-499f-9770-e7ce516ff446/40665550728.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 5396 bytes
SHA-256: 39c0c9fa9617e1672cedb969c9e426f7ede84305fe2f7597185e1dcc9ccac652
font_01_sfnt_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 10676 bytes
SHA-256: 9db86a9bb755b3964598924e30c5c4bc536b9e017938fd95b7e240c22d7ec981
font_02_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3