Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf265369cf3d4d0…

MALICIOUS

PDF

90.8 KB Created: 2021-03-19 05:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f6e262628e225e5c6564e813cf8ece08 SHA-1: d9eb137e3494741d496269eaab7814a26ca8e829 SHA-256: 1cf265369cf3d4d0c92d257e9571f2274f2b382b4e2024a7f67ae2ca0c4e8045
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as pointing to known malicious redirector infrastructure. The document's structure and the presence of many links on disposable hosting suggest a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=the+first+book+of+enoch+text In PDF document text
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/narolukutuxukut.pdfIn PDF document text
    • https://cdn.sqhk.co/guxifunuris/hZWhiSu/54657898477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_5fe9fe9861568.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/daximasisadexafuwakuv.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/dodinudesofitidesewo.pdfIn PDF document text
    • http://vatemuredaxusob.22web.org/62372424928.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/tanidegejujapo.pdfIn PDF document text
    • https://sawinabepetejex.weebly.com/uploads/1/3/4/7/134714359/datotidubavakegifuru.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/igihdhi/best_weapon_builds_modern_warfare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_60474d81620aa.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/numark_ttusb_belt_size.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455894/normal_601704b774a03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447466/normal_602e1cc2b6c5b.pdfIn PDF document text
    • http://jegagavakunumog.iblogger.org/nesa_accreditation_summary_report.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/4c3cf2bce.pdfIn PDF document text
    • http://giwewewobarijis.22web.org/how_much_does_a_counselling_psychologist_earn_in_india.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/zufipug_konigegibexab_kegijirexidub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xebowuruno.epizy.com/applications_of_nanotechnology_ppt_free.pdfIn PDF document text
    • http://susabumo.atwebpages.com/79993967330.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_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 4948 bytes
SHA-256: 3b99aa38f525dd836610aa7bbc27f54b798df15914ca92edde38ae92d0d1d2e4
font_01_sfnt_off00013a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4B 10660 bytes
SHA-256: 2e808399ba424cad47a9dfa042e36c2bd0d4de7c2dc21f4e7b586da39b228fa1

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