Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba8b71579e8d921…

MALICIOUS

PDF

73.2 KB Created: 2021-02-26 14:36:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8961f5afd1e35e729769405f622a1d22 SHA-1: fd5479b6f7c60c286796e5c4ad27c18214339da6 SHA-256: 1ba8b71579e8d921d03ee92f098a50119d037e513b6473b41574b3e63776196f
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a link farm with numerous external URLs, suggesting it's designed to redirect users to potentially harmful websites. The document body, though partially corrupted, contains a title related to 'washing machine odor' which serves as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://xezojetit.ru/award?keyword=how+to+get+rid+of+top+loading+washing+machine+odor PDF link annotation
    • https://cdn.sqhk.co/kawurefeki/jHfhdU5/92998784701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467612/normal_5fe48a7150791.pdfIn PDF document text
    • https://cdn.sqhk.co/vedukosamo/BOibaDx/9877473877.pdfIn PDF document text
    • https://zunemugegixado.weebly.com/uploads/1/3/4/6/134698728/razosabiv.pdfIn PDF document text
    • http://tuworiki.22web.org/gmp_inspection_report_community_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417669/normal_5fe482e60db3d.pdfIn PDF document text
    • https://nirumoxizexajiv.weebly.com/uploads/1/3/4/5/134524745/9170817.pdfIn PDF document text
    • https://tekagilodepini.weebly.com/uploads/1/3/0/8/130813992/256ca72f.pdfIn PDF document text
    • https://guverududilo.weebly.com/uploads/1/3/6/0/136086053/3271347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415768/normal_5fdc507029092.pdfIn PDF document text
    • http://wapavekegiwuxaw.iblogger.org/infectious_disease_movie_contagion_worksheet_answer_key.pdfIn PDF document text
    • https://kadonomu.weebly.com/uploads/1/3/1/4/131454950/dazemidumasi.pdfIn PDF document text
    • http://zamuxodub.22web.org/kurisawezuzimu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuteninuxad.rf.gd/legacy_of_ashes_review.pdfIn PDF document text
    • http://tifalupu.rf.gd/words_that_start_with_x_for_kindergarten_show_and_tell.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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 5624 bytes
SHA-256: b0442b695d06727cf50b2b737ac9d8a55073f76c9fd5c4c246b0b931398859c9
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 10184 bytes
SHA-256: 48793da0bcd5a4f2ef30f368ad69679aa29ccf0359dee2b794bf1e7157145b37

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