Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ef1b41145463f5…

MALICIOUS

PDF

66.9 KB Created: 2020-11-11 03:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7302c61a45e6a9c69ce8adaf0c6e6451 SHA-1: d420c40189ecdf756eaaf02b79b9ee025488da5a SHA-256: b6ef1b41145463f5fe245664eb3fbe4369b09d8f5e344c103baa955e82663ffa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm or SEO spam, containing a large number of external links. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?keyword=a+guide+to+fashion+sewing+6th+edition+pdf
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/3857256.pdf
    • https://tezadogiva.weebly.com/uploads/1/3/4/5/134522012/7bd26.pdf
    • https://ditutemisa.weebly.com/uploads/1/3/4/3/134381329/3757be3ae.pdf
    • https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/tazunotumomunir_bitowiz_wonomopanusadep.pdf
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/7c57fb0c1e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/susopuzupure/lte_capacity_planning.pdf
    • https://uploads.strikinglycdn.com/files/8c400870-88d4-4dfa-88a4-d53402d49f3a/yahoo_sports_app.pdf
    • https://uploads.strikinglycdn.com/files/748ee7f2-89e3-48ed-8ed9-0c3139155b7e/10928953260.pdf
    • https://uploads.strikinglycdn.com/files/7cdd1d7d-45c0-40cc-97fc-43f29e4e3a1f/kigilubenogatu.pdf
    • https://uploads.strikinglycdn.com/files/3b160eda-2003-4c14-97dd-1c29dd9dcbc6/geometry_proof_worksheet_parallelograms.pdf
    • https://uploads.strikinglycdn.com/files/f7e32bc7-62cb-4605-ba2a-cf78493a9a8e/31042582730.pdf
    • https://s3.amazonaws.com/sesafefanulokam/lone_star_high_school_supply_list.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/gesotenodomodobufu.pdf
    • https://s3.amazonaws.com/xanebavifamopez/jefofibinaniz.pdf
    • https://uploads.strikinglycdn.com/files/4f1bef0e-1c50-47ae-aad5-5620711f4c25/kabapam.pdf
    • https://uploads.strikinglycdn.com/files/175f1f59-37b5-4e7e-bd2d-ee1a482dbdc6/63080423573.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c873.bin
3e835fc0b18d8d8d7f6b4120a822cc0b96ec0a38e9398ef02fbdb7c60f8e6ac6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 5408 bytes
font_01_sfnt_off0000dafa.bin
06b1d52bfba0e922d3b6436348cc1b3cbf5cea3e9de24eeb67116dd05e0dfc08
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 10420 bytes