Malicious PDF — malware analysis report

Static analysis result for SHA-256 227716b63e246602…

MALICIOUS

PDF

76.6 KB Created: 2021-06-11 06:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee0bf0eea501b8c40bed2a4dd7a1e731 SHA-1: 51fc790ebc22a1052ce3fcfe181bf2e1dcb973f3 SHA-256: 227716b63e2466021656e0f058c1da4d22615c556779568b98319254c547ff97
66 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs and is flagged as malicious by an ML classifier. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://nomylo.ru/pbw?utm_term=the+secret+book+in+telugu+free+download
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/79880.pdf
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/woxulanumamox.pdf
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5fc7be60a9108.pdf
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/c62673.pdf
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/4438819.pdf
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/641596.pdf
    • https://static.s123-cdn-static.com/uploads/4445107/normal_60088ab4082e7.pdf
    • https://cdn-cms.f-static.net/uploads/4485156/normal_5fd2dffbb0fed.pdf
    • https://cdn-cms.f-static.net/uploads/4528915/normal_606ce5bfeb029.pdf
    • https://cdn-cms.f-static.net/uploads/4473322/normal_605b919944eae.pdf
    • https://vasabofilusav.weebly.com/uploads/1/3/4/5/134585229/pekaxexib.pdf
    • https://rujazako.weebly.com/uploads/1/3/4/4/134471695/7457200.pdf
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/vunatasiv-jeraku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mifimoruzuwo.pbworks.com/f/does_king_lear_deserve_his_fate.pdf
    • http://welomobo.pbworks.com/f/mkv_to_mp4_converter_mac_free.pdf
    • http://xedidovetaw.pbworks.com/f/fiche_fraction_cm1.pdf
    • http://sirazumebow.pbworks.com/w/file/fetch/144905466/arabalar_imek_hz_apk_indir_son_srm.pdf
    • http://dewubuk.pbworks.com/f/free_photoshop_infographic_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e47a.bin
dc2508e260e2967747ff13f612eb9eee856a7133d6cdc0e4a38ca4e95a254469		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 5528 bytes
font_01_sfnt_off0000f74c.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 1800 bytes
font_02_sfnt_off0000ffda.bin
8e0919f97ea5529cc178f413b9efe9f9c31f2c3587118250c833e7a5674c24fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10952 bytes

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