Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9fc8fff2e749a1…

MALICIOUS

PDF

67.4 KB Created: 2021-02-12 02:25:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 58a911cb56d705c9bcbca50be1244597 SHA-1: 116cd21def787caf6d5d0a6b5f6a9b1fec4673ff SHA-256: 7f9fc8fff2e749a1508add751efd1b6994b4a5b007a788cd85283a9571f623a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting or link farm services, indicating a likely SEO manipulation or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content. While no scripts were directly extracted, the structure and heuristics point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=30+inch+aquarium+hood+light PDF link annotation
    • https://cdn.sqhk.co/sozimelizak/jb7hegf/clash_of_clans_th13_farming_base_link.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/ejgTwgi/patagonia_endless_run_shorts_uk.pdfIn PDF document text
    • https://zeruposizagaki.weebly.com/uploads/1/3/4/8/134854722/647393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_600dd2a9d45d0.pdfIn PDF document text
    • http://uscreditreport.info/transformers_bumblebee_movie_blitzwing_toy8m9ub.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/igwZoGD/wugovigo.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/rMoQjgl/84650634121.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5ff52b436d648.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/jagepUK/30978714157.pdfIn PDF document text
    • https://cdn.sqhk.co/salusasopuvi/7iiZ1Bc/the_viking_treasure_hunter.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/10ebf59f9.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/fZtOiaG/44211704470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gugawojakopa.rf.gd/72849247051.pdfIn PDF document text
    • http://suwotewi.epizy.com/titoluloputekisogan.pdfIn PDF document text
    • http://rexenejo.epizy.com/guild_wars_nightfall_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB8 5276 bytes
SHA-256: a114ef89db98e0c70f4d13c032a0b06c502a47ab3f84ecc582ee77002573e6dd
font_01_sfnt_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 11284 bytes
SHA-256: 4c273c099192ff4930ce07efbd5f65d963c431f709e8e21eacbe0ad34b499349
font_02_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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