Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f00ef4a9edec2f3…

MALICIOUS

PDF

76.5 KB Created: 2021-06-13 12:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad6b32b99a56cb96d43bffac31a6cfd6 SHA-1: e2cd10868fa76d63e80433da9bfd6931485a061a SHA-256: 9f00ef4a9edec2f3e870688d3b5a2597caa369a14c032db3258ca1b604315bd0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the primary links, https://allytemp.ru/pbw?utm_term=saki+saki+song+remix, is directly embedded in the document. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm, possibly to distribute further malware or engage in SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://allytemp.ru/pbw?utm_term=saki+saki+song+remix
    • https://cdn-cms.f-static.net/uploads/4491450/normal_604e707b4a5de.pdf
    • https://cdn-cms.f-static.net/uploads/4401716/normal_6019236af2e8d.pdf
    • https://zogujajuzeve.weebly.com/uploads/1/3/5/3/135392671/zitakew_zevaresuwati_jaxomonazisawen_vakumefexuf.pdf
    • https://cdn-cms.f-static.net/uploads/4407818/normal_600a24e576228.pdf
    • https://static.s123-cdn-static-d.com/uploads/4475564/normal_60b315c0d3d9c.pdf
    • https://cdn-cms.f-static.net/uploads/4410702/normal_600f5476b559f.pdf
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5ffbdbf4dff7b.pdf
    • https://static.s123-cdn-static.com/uploads/4418762/normal_60067cc2deec6.pdf
    • https://static.s123-cdn-static.com/uploads/4482027/normal_5ff28643cdc9c.pdf
    • https://cdn-cms.f-static.net/uploads/4451348/normal_60145b903a0e8.pdf
    • https://static.s123-cdn-static.com/uploads/4483836/normal_6004efe2b3489.pdf
    • https://cdn-cms.f-static.net/uploads/4377647/normal_60b932f146732.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/1b596dde7b71.pdf
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/difisovetizakan.pdf
    • https://cdn-cms.f-static.net/uploads/4388424/normal_60b8aae442852.pdf
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5fcd9dd6ab72d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://demogotujod.pbworks.com/w/file/fetch/144831156/printable_christmas_colouring_pages_for_toddlers.pdf
    • https://uploads.strikinglycdn.com/files/9a6677cf-69cc-495e-ac8b-22f33c5a4e36/fe_exam_preparation_materials.pdf
    • http://sikawejedi.pbworks.com/f/juzip.pdf
    • http://suxogovexig.pbworks.com/w/file/fetch/144894849/past_simple_regular_verbs_exercises_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/6ed53f0d-536b-47f1-8b17-b7c5f8b44c92/21486271052.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_off0000e085.bin
af0cb25794b58f6990ce50c952150c99f95939785c1f8fb0b824ab57bee00de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 4916 bytes
font_01_sfnt_off0000f10b.bin
d1b3d9546d8665c7cf66c515488d06bafcc6bc27edaf6aafa3259c524f48f79a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 10852 bytes
font_02_sfnt_off00011644.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 4324 bytes

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