Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f5c21c68daef30…

MALICIOUS

PDF

33.2 KB Created: 2020-11-06 16:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8be09e3a693f4312cb3091a88184ea4a SHA-1: 7ac9e9797da338e326a394648a3a660a2a67ae49 SHA-256: f5f5c21c68daef30598db6e827d9d25fd4676001864a56a4999ae97ed9da58a9
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or phishing attempt. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a link farm heuristic supports this. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a social engineering attack to drive downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffnew.ru/aws?keyword=bloons+td+4+download+free+apk PDF link annotation
    • https://lumodafudewose.weebly.com/uploads/1/3/4/4/134480169/a7bdb0.pdfIn PDF document text
    • https://dabituge.weebly.com/uploads/1/3/4/3/134344098/945974.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/gudag.pdfIn PDF document text
    • https://nuvefiwepopowu.weebly.com/uploads/1/3/4/5/134502743/c6f345d.pdfIn PDF document text
    • https://valekide.weebly.com/uploads/1/3/4/5/134584612/rubigiz.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/vezumobigodub/87862604687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1668aa3c-f915-47e9-9343-d946a88b5654/66153387517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb24fd6f-1107-4b8f-8f3e-4f765c99d974/meyer_snow_plow_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/37872782679.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/minecraft_gear_vr_edition_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/c_basic_objective_questions_and_answers.pdfIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43C6 5328 bytes
SHA-256: 89abd88fbb89b6b9fd426af19df3d2f50ff354c14c58199c0b413c59e382c299
font_01_sfnt_off00005617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5617 10008 bytes
SHA-256: 43c7974865049fe00b5035fa3554365c7e2bb95a50f7228c27ed58b1c30166fc

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