Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0c3c93c39be872…

MALICIOUS

PDF

76.3 KB Created: 2021-03-09 17:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a7562804eac55a7a0a83458225d89546 SHA-1: 8947ea0f2d680e91470b9949dbbbfe25bc5e0ea5 SHA-256: 4e0c3c93c39be8729b56aa2e2666585cf29be18ff0f91bc3068494a7df1be5db
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to redirect users to potentially harmful content or phishing sites. The presence of embedded URLs and the PDF structure itself indicate a deliberate effort to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=irobot+roomba+960+black+friday+2019 PDF link annotation
    • https://cdn.sqhk.co/leredupodeka/fieieAw/susoxedonevipuxusu.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/gexufevorotowexut.pdfIn PDF document text
    • https://cdn.sqhk.co/gixobujikelu/ojiGhdo/sling_drift_apk_download.pdfIn PDF document text
    • https://jawokisejul.weebly.com/uploads/1/3/4/6/134601468/ditop-wusarigun-teduwobufe.pdfIn PDF document text
    • https://cdn.sqhk.co/takoxuwal/hejhift/international_business_news_articles_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/Fnxjdij/goal._com_uk_transfers.pdfIn PDF document text
    • https://cdn.sqhk.co/migixurej/5KCQfaE/cara_download_naruto_x_boruto_ninja_tribes_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/fyPjMhi/giwudefokuv.pdfIn PDF document text
    • https://ronukeva.weebly.com/uploads/1/3/5/3/135385202/kapipusibomos.pdfIn PDF document text
    • https://cdn.sqhk.co/luwanuriwaba/iiMKol6/27617281785.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/TqXhbhi/10036806797.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/iigdFhg/talking_dog_show_netflix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/gurajakaferuzibovoligex.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_34860c25bdb245f4bd7f36cec72188d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/nunodixuseguta.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_3bc2e18fdbad498cb691ab5a6d87ea5c.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_ee8e3cdf861e4e10b9c895d7151d1a5b.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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 5868 bytes
SHA-256: 8603caf4763125d717fdc5b1c87562583577d7cb1c6b2558a229d9885288f7ab
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 11880 bytes
SHA-256: 18b77648962ad17c823e8f68228ef2823c727ca10f2c3769d1ffa9fbd807f60d

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