Malicious PDF — malware analysis report

Static analysis result for SHA-256 0932c4875bbbe113…

MALICIOUS

PDF

73.4 KB Created: 2020-11-19 04:20:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 77a0e27b3fc2b818098de635edf76949 SHA-1: 70acbef1c6d54bccc9cb688a0588ff0101bd78fe SHA-256: 0932c4875bbbe11340f1302d2ef4225289c1b39ea5ae4fd037c46dc154a7f994
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=ridgid+router+guide+bushing+kit In PDF document text
    • https://bowukobi.weebly.com/uploads/1/3/4/7/134706413/3117436.pdfIn PDF document text
    • https://xorusisu.weebly.com/uploads/1/3/4/3/134314808/merab_wolixapo_tiwilun_lanebumoz.pdfIn PDF document text
    • https://dodupezuvu.weebly.com/uploads/1/3/4/4/134443873/numijunoteke.pdfIn PDF document text
    • https://kepelawurolunuz.weebly.com/uploads/1/3/4/0/134017158/b0228fc751335.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/3822842.pdfIn PDF document text
    • https://pirivelel.weebly.com/uploads/1/3/4/5/134505874/3633898.pdfIn PDF document text
    • https://mijekuwovosi.weebly.com/uploads/1/3/4/3/134321571/75d15997c5f2.pdfIn PDF document text
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/xogoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_5fad85b09addf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5fad3fcd6b976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90b2b49-7826-4df1-a452-a4a91adcb2ab/xodotezuwotudex.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/zen_and_the_art_of_motorcycle_maintenance_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/north_karana_p99.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/wuwibusakekezuse.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/16092920235.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/31730051455.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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 5056 bytes
SHA-256: 631b0ceaf7162285ecd29a0d4194a33c59ca1cfb9f99f8f48cf0ba29db85fe3c
font_01_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 12152 bytes
SHA-256: 9704d4ef84050473bc60f841d936014d49224c248175dcb05e30df88ca2a2aa1

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