Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f454c8b5a552e4…

MALICIOUS

PDF

70.7 KB Created: 2021-06-11 04:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 134f2c8e495948170aec1e24f209aa9f SHA-1: 52cc36d8a107a61b382f443674a76b8c2a0a4949 SHA-256: 32f454c8b5a552e48d74db1e228b41d7afdaba3af7c7ef5839db33a3e382dc18
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and numerous URLs point to a deceptive lure.

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://philabc.ru/pbw?utm_term=compress+pdf+200+kb+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423429/normal_604cbcdf64feb.pdfIn PDF document text
    • https://xozojijeb.weebly.com/uploads/1/3/4/4/134436315/8673554.pdfIn PDF document text
    • https://tedibijufu.weebly.com/uploads/1/3/4/6/134678634/3806927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_5fc9f9a484453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_6069eaf4d0e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_600eb7097ea6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_6027c77a67db0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426550/normal_60c1da58c424d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_60b947205fbfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_60475e852582c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446158/normal_5fc96eac3ebdb.pdfIn PDF document text
    • https://sorudexene.weebly.com/uploads/1/3/1/3/131384015/aabf21c9fc59.pdfIn PDF document text
    • https://bedeliwukaror.weebly.com/uploads/1/3/4/5/134512578/duvikiwizanigi-larapif-dugokimiwaxas-woluvogejavofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_6046c0a2530fc.pdfIn PDF document text
    • https://buzapakamewogu.weebly.com/uploads/1/3/4/3/134366326/0672700b6cdd7.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4413462/normal_60b21745daf8c.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/9014748.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 5360 bytes
SHA-256: 7a22eaff8e754a7eb182448f267795b6787f01003153472a0f6c15fe24bd3cae
font_01_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 10916 bytes
SHA-256: 850c5e5140c85692fa9f0c8f7f2c4dddf0c415527ca0e902f9ce763b09d70744

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