Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fc958bec4253aa…

MALICIOUS

PDF

89.7 KB Created: 2021-03-22 09:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 15c1d73713d9a58f951b88107252247a SHA-1: 10f413914edb8fe15a8718d6d5d3bcd8f0530bf7 SHA-256: a0fc958bec4253aa41932d945e7f8ad635e4727e370b34acba386ed447fecbcb
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, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to redirect users to malicious sites. The embedded URLs and the document's structure point towards an attempt to lure users to potentially harmful content.

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://resalured.ru/award?keyword=asme+b16+47+series+b+pdf PDF link annotation
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/walopebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_602110583db26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_604d9783542cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407989/normal_6056be1fbda69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5fe97bbb16354.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/betefasasajikawime.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/rubexirej_vokaxosaxev_bulapudeliw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolopob.epizy.com/fedex_customer_service_mail_id.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_5112c43ffd78464a84da1cc23e7974d6.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_63fdef17624e4efa9f477c0e4de2c9d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/97509747653.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_afd15562ace0484abab582f488049827.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/email_format_template_html.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/79626731124.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/36351849781.pdfIn PDF document text
    • http://bixoravu.epizy.com/xuvikivasitobatiwosaxet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 5448 bytes
SHA-256: ba5803f4a9538676ded8bd31e197ca1adda3a118298567cd0325c7bf20fa91cb
font_01_sfnt_off00012ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA9 14532 bytes
SHA-256: f9addd10cdf556ea74ffc9532f792d62d6625bdf3aa32f2b3dac38fe5a472488

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