Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31f2e08b23ed03d…

MALICIOUS

PDF

69.3 KB Created: 2021-02-23 03:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f80490ec4e68ed35c2b22bd7bdf27514 SHA-1: 5c58f125c9f43a1264d4d7fad2c18504aead50c3 SHA-256: a31f2e08b23ed03d4cd0533cb807817339960f9bebc7d3fbf5a60863a7031cf5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious. It contains numerous external URIs, many of which point to disposable hosting and form a link farm, suggesting a tactic to distribute malicious content or phish for information. The document body, though heavily obfuscated, appears to be a lure related to a service manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=craftsman+ys4500+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421224/normal_60256c8108275.pdfIn PDF document text
    • http://nakozovuzu.22web.org/xibovoduniz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_60175c52b722f.pdfIn PDF document text
    • http://triple-doska5.club/golden_secrets_of_mystic_oilscx3d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/gevorujixawutu.pdfIn PDF document text
    • http://dobifagamuwu.rf.gd/75616821337.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/java_tutorial_for_beginners_using_eclipse.pdfIn PDF document text
    • http://lenixad.epizy.com/nonorijolawazozi.pdfIn PDF document text
    • http://bovamiwojilonem.epizy.com/28928352864.pdfIn PDF document text
    • http://giratas.epizy.com/lomub.pdfIn PDF document text
    • http://xazinipigoxowe.epizy.com/vpn_master_vip_premium_apk.pdfIn 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_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 5448 bytes
SHA-256: bb52ad6154747da11125c668e549d781054acbdac56d704eeafc7b35c9f0018a
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 10292 bytes
SHA-256: b0e93ea7b70e2f97d8c4a1d17bcdbbac53a2e8f39b5aed663b40a33525d680e0