Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ecdaac9c7207c0…

MALICIOUS

PDF

77.1 KB Created: 2021-03-20 16:13:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cbd2c165b53b474c2a011aa3e729cf7d SHA-1: 4b320b15a517cf834635319d854c57f7c121a6a2 SHA-256: f4ecdaac9c7207c01e527717b6de86b2ff57e09310637390d88eeb6ce8127116
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The ML classifier strongly suggests maliciousness, and the presence of numerous links to potentially unrelated content points towards SEO manipulation or a distribution mechanism for further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://seumenha.ru/award?keyword=trochanteric+bursitis+exercises+nhs+pdf PDF link annotation
    • https://nemimatavowep.weebly.com/uploads/1/3/4/6/134692492/domajili-pawexizu.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/nWjaibL/72168528224.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/QhgihIm/airbnb_san_diego_pacific_beach.pdfIn PDF document text
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/310f70457fba31d.pdfIn PDF document text
    • http://good-production16.site/marvel_what_if_tv_series_release_datesmsr2i.pdfIn PDF document text
    • http://net-klientov.ru/hunger_games_catching_fire_full_movie_free_streamingp44cm.pdfIn PDF document text
    • https://fenatafu.weebly.com/uploads/1/3/1/6/131637570/gutofonep.pdfIn PDF document text
    • http://jushq.pro/dell_monitor_2001fp_manualpgpzn.pdfIn PDF document text
    • https://sejuxotanodefif.weebly.com/uploads/1/3/5/9/135957191/sumit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_60318798310b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_601b49698cfa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_5fd6c88406f42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480728/normal_5ff5d3feaa7e8.pdfIn PDF document text
    • https://fozonened.weebly.com/uploads/1/3/5/3/135326763/5d53d98f612f2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5fe293169f146.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/bUdhbhd/scorpion_finishing_moves_mortal_kombat_x_xbox_one.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/pesetufavo/information_about_india_gate_wikipedia.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_4bb45642f08944b78d042c9e2410130d.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_9bfab4af99ec494e8aa1c77cbdf6adec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/cordell_hull_fishing_report.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_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 5368 bytes
SHA-256: b024090aa42921667983933413e6f758c7998d8d68730a39f800b2b0f810274b
font_01_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 10472 bytes
SHA-256: f015bcecaa58633ed808058593bb5530343e20c6fcd1647ada344129a5ef2d1f

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