Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd1f8deb193f2cd…

MALICIOUS

PDF

64.3 KB Created: 2020-12-25 10:02:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5a9f73d9cbfbe6924ea4fb1b1490280f SHA-1: c74b0fff080b3458531dd22744d46557b9fd36b1 SHA-256: 0fd1f8deb193f2cd837175da6ce8392090645bb41e35688f3307576535477b10
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains keywords related to wallpapers and Android, likely serving as a lure to attract clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafffi.ru/aws?utm_term=baby+pictures+wallpapers+for+android PDF link annotation
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/a65ee92.pdfIn PDF document text
    • https://gidujinogojavu.weebly.com/uploads/1/3/4/0/134096303/12d9adbcb7ec.pdfIn PDF document text
    • https://cdn.sqhk.co/febenanedibu/djbhhjc/wugumijewel.pdfIn PDF document text
    • https://rogusavonovupe.weebly.com/uploads/1/3/3/9/133997589/wipubamadixixo_zaxarowuzula.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/donodaruroravapizuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_5fa66978ee2d4.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/hghMhio/cat_condo_2_game_for_free.pdfIn PDF document text
    • https://sosegesidor.weebly.com/uploads/1/3/4/4/134465043/gavej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_5f956f2e8b42f.pdfIn PDF document text
    • https://cdn.sqhk.co/sufadoma/hgWggjj/nostalgia_definition_english.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/tozugonuraber-relesafuvi-todinirupotorof-panikik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420013/normal_5fbe3121701a9.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/lunaba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477655/normal_5fc7fa9b0e1bc.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_off0000be8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8B 5532 bytes
SHA-256: 5d05785e3f0ddf8780e2fc16cd21e89a2efc3109c6177eec756bb4dd07b395d0
font_01_sfnt_off0000d17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 9776 bytes
SHA-256: 4e1f8afd2d9297e209aed4e395c828886fcde05b65fce76fd288b933e30d381f

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