Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70bc7cb6392c025…

MALICIOUS

PDF

66.5 KB Created: 2021-04-18 01:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ef68d0b04517308f41660c2560513f3 SHA-1: b08697de289a611453cafbc28bd80cadbe97ef1a SHA-256: c70bc7cb6392c0256f0a0091337251fd3cea1ee7247517a4026712709500cec3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=wittgenstein%2527s+mistress+ebook
    • https://wojebera.weebly.com/uploads/1/3/0/7/130775791/681294.pdf
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/4094595.pdf
    • http://useplafond.xyz/30758718974sdgjx.pdf
    • http://wapazezaduv.iblogger.org/rpp_biologi_sma_kelas_x_kurikulum_2020_revisi_2020.pdf
    • http://1xbet-sportstavki.fun/como_entrenar_a_tu_dragon_onlinete4m1.pdf
    • https://xexofukirusolim.weebly.com/uploads/1/3/4/8/134871283/4289245.pdf
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/71995a8499be8.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://dunexekexafu.weebly.com/uploads/1/3/4/6/134622254/kamefikif-lobekida-zotilalafedob.pdf
    • http://bonboxstudio.com/passive_bandpass_filter_circuit_breadboard47evm.pdf
    • http://renijulemigato.iblogger.org/simpson_power_washer_3200_psi_reviews.pdf
    • https://nosavarugogitov.weebly.com/uploads/1/3/4/4/134488680/2474f7587.pdf
    • http://titanof-filtr.ru/rivibefogitosesopemexil76ear.pdf
    • http://xepomujix.22web.org/dometic_awning_manual_retract.pdf
    • https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/646579.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_d72b0acc6e0b4e5884c2d209af537194.pdf?index=true
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_18a8a9c7881045af8e61e42c6a8fc1c2.pdf?index=true
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_e45c4c695514437782aca2f751ea8966.pdf?index=true
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_9ea37f8ad0c849e9a80ce3d2886e96d8.pdf?index=true
    • http://votatabebunika.rf.gd/71973099113.pdf
    • https://26b54b0d-7067-4615-bd5a-e9f638bc9197.filesusr.com/ugd/26f5b5_206f557f05c5445995bc5649ede4af7b.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_off0000c7d1.bin
799ded50afa27d149547522e0739d71ddb23e29e1af7cb1cda84774b47cdf298		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D1 5012 bytes
font_01_sfnt_off0000d8ea.bin
052f5ed543ee3ca2bf8ee36a0a32fffed34810717748ba82dc2161f3835be387		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 10612 bytes

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