Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc12e53ab15d09f…

MALICIOUS

PDF

84.6 KB Created: 2021-03-30 07:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce0177d03d2778af00ed2ee4ccc5f22f SHA-1: 8ec8003e26616683f24682bafbfe93a9f46dfb08 SHA-256: 7cc12e53ab15d09fa0ec8b88738f7e27192d0f8f5f9e2055c81a20a0d230d82e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spamming operation. One of the primary URLs extracted is https://dafemum.ru/123?utm_term=waiting+for+the+barbarians+poem+pdf, which appears to be a gateway to this network of malicious links. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-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://dafemum.ru/123?utm_term=waiting+for+the+barbarians+poem+pdf
    • http://xitigedomure.66ghz.com/lavewimu.pdf
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5ff950e621e62.pdf
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/54d0d7.pdf
    • https://cdn-cms.f-static.net/uploads/4451544/normal_602afc333c961.pdf
    • http://labiluwewinedu.22web.org/coliform_definition_geology.pdf
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/zivare.pdf
    • https://topudikuwem.weebly.com/uploads/1/3/4/0/134042537/0f5dc9b1b1e879.pdf
    • https://static.s123-cdn-static.com/uploads/4485296/normal_5fe4fff8c1adf.pdf
    • http://boribonabone.mypressonline.com/the_book_of_life_2.pdf
    • https://purigimotefejis.weebly.com/uploads/1/3/4/3/134308192/69345.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nuluwajewugutik.onlinewebshop.net/documentary_storytelling.pdf
    • http://bogizun.epizy.com/bushido_blade_2_psx.pdf
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_57698ff4ac614a29a9f79cdd18e151bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e57843d-7472-482d-8af8-c4ecfe7c156a/90583701036.pdf
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_79440eca648a48b5a31d11439e1ab12a.pdf?index=true
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_ff5d1d33097b47f091c644b789e0f9f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25d66dfd-f078-4008-99ac-a2197f138fab/ms-7778_ver_1.0_cmos_reset.pdf
    • http://fafalibowadavuz.rf.gd/how_to_flip_tires_exercise.pdf
    • https://uploads.strikinglycdn.com/files/a2e28453-e744-4671-a28d-2ec32edb9700/24550461377.pdf
    • https://uploads.strikinglycdn.com/files/48dbb172-566a-4989-8c17-20e3178baad7/74652329462.pdf
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_e50d4d11de9745b38199278b31847b79.pdf?index=true
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_013f1c0caa244915b160a89f694dc825.pdf?index=true
    • http://mujigakevomo.epizy.com/homeostasis_in_the_human_body.pdf
    • 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_off00010760.bin
43105fe47e4055a4ccdd94f9452a6fbabd7f926d48140e3276d153b8ed17072d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 5576 bytes
font_01_sfnt_off00011a35.bin
ca78da8b215fa0416ddcc6dfce08330b27db2f5c828faca96eb8fdde386f84c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 13264 bytes

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