Malicious PDF — malware analysis report

Static analysis result for SHA-256 a111269460c7607b…

MALICIOUS

PDF

71.0 KB Created: 2020-11-23 09:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7f9538717cc39b072244900409712d71 SHA-1: 2b12e6da0965187cb806140a4510da335d07e915 SHA-256: a111269460c7607bc1931aa8b77c4371d404e0ef41d502ae35cf653492178e06
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. Heuristics like PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest malicious intent. The ClamAV detection and ML classifier further support this assessment, classifying it as a phishing trojan.

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
  • 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.
  • 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.
  • 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=best+yahoo+email+app+for+android In PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/bamowiwuriw-gelobizolo-pesisameturor.pdfIn PDF document text
    • https://pimakiwukusa.weebly.com/uploads/1/3/4/7/134712386/6b41bb699068b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5fbb21c1941b9.pdfIn PDF document text
    • https://sadixudodexoz.weebly.com/uploads/1/3/4/2/134234615/xumidesegab-mupep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_5f9fb2b58466c.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/munedebamasa-jufevidovipev-gepazot-tilesuvokejinof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fa9aec5b6df2.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/kalubegimexu_kivojuxutoj_woletefakos_xisomumi.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/fd718951-39d6-47ce-b235-af597c541e37/2_radini_grdos.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/leguv.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/cause_and_effect_on_industrial_revolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc3e1c2b-6079-4842-9499-2b98bddce270/sedekaxonewodifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93de7589-e5b4-424f-aa09-f71e24167636/41634023094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16dfed2f-0917-4671-b46a-56aee3705dbe/all_natural_kidney_health.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e64198e1-75ac-4802-a18b-b964a5d59ac1/zazapibasekipu.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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 5432 bytes
SHA-256: 9e3886c62acbf4a04ebab5830b3424e7c2782b0d901a735cafbff67335928fa2
font_01_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 10824 bytes
SHA-256: f6ce4b0dba326488eaec900891416f37dbaccac26d5d6817c09e091c82856ec6

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