Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1232fd720c39d1…

MALICIOUS

PDF

67.2 KB Created: 2021-05-22 14:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 15bb5f1fda639ccbb1714ea1ac13f3cd SHA-1: 5cc61d0a97b2f81a819fc374ac75764827883d6b SHA-256: 7a1232fd720c39d1ce0a8b0421d280283a35e92f5c0653bdbbd6c05c96491783
214 Risk Score

Malware Insights

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

The sample was flagged by multiple critical heuristics indicating malicious redirector links and a link farm, strongly suggesting a phishing or malware distribution attempt. The embedded URLs point to external infrastructure designed to host further malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=libro+de+algebra+dgeti In PDF document text
    • https://buvijolijesikuv.weebly.com/uploads/1/3/4/6/134602818/f99d9c33098c.pdfIn PDF document text
    • https://zomujowedava.weebly.com/uploads/1/3/4/6/134629266/1e4af47a537a0.pdfIn PDF document text
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/tizizutop-gobal.pdfIn PDF document text
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/6eb883650c.pdfIn PDF document text
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/7393105.pdfIn PDF document text
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/e90fd2521258a1d.pdfIn PDF document text
    • https://pixijitawe.weebly.com/uploads/1/3/4/5/134593468/4191639.pdfIn PDF document text
    • https://pubategikosiw.weebly.com/uploads/1/3/4/1/134131453/010c6f266f8c.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/niwaxa.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/dibukokuzo.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/paxuvagal/35168852972.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/kufajivutujigewuf.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/pamasoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/dumbarton_fc_ground_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/hauppauge_wintv_v7_product_code.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/jipedasanirore.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/69672387742.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/xefen.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/70264081721.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/my_plantronics_bluetooth_headset_is_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/nice_paediatric_palliative_care_guidelines.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_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 4896 bytes
SHA-256: 6f8d3487f0ea2d819543e3b09073d7e37c41a93e1c234b72cbe79eee6601e08c
font_01_sfnt_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 11776 bytes
SHA-256: 5de074b465c4f66e257b5e4d64b060595a07a06e4d4f1683e7ce13b3cda4990a

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