Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff5159dca03e4b1…

MALICIOUS

PDF

86.2 KB Created: 2021-05-25 09:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e6d4a2996ffd7a9b305e81afe0fab39 SHA-1: 70ff263b2e7b435abe942ce7f068b14993c576d2 SHA-256: 3ff5159dca03e4b19949454fc3b4918432dc6ba449eed7cece697e1122f57995
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to PDFs, suggesting a link farm or SEO manipulation tactic. The primary URL, https://vilenefex.ru/strik?utm_term=the+bodybuilder%2527s+nutrition+book+pdf+free+download, is likely part of a phishing or scam operation disguised as a free download. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, possibly involving embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=the+bodybuilder%2527s+nutrition+book+pdf+free+download
    • https://guzokilib.weebly.com/uploads/1/3/2/7/132741743/d412c09139.pdf
    • https://javetepamez.weebly.com/uploads/1/3/0/8/130814931/f0502.pdf
    • https://static.s123-cdn-static.com/uploads/4369782/normal_5fde5fc0c90bb.pdf
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/69ab9.pdf
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/bopoboviwivake-kekikepabali-nodejajenupisag-gozef.pdf
    • https://veledagovivavav.weebly.com/uploads/1/3/2/6/132681602/121088.pdf
    • https://static.s123-cdn-static.com/uploads/4446162/normal_5fe28b125b0bf.pdf
    • https://pipepolubewaxa.weebly.com/uploads/1/3/4/7/134709371/7594526.pdf
    • https://cdn-cms.f-static.net/uploads/4421466/normal_6011c246287f0.pdf
    • https://winojarenegesut.weebly.com/uploads/1/3/4/4/134481716/81132e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8d66654a-4649-4489-ad93-487e7c5b91df/76736069139.pdf
    • https://s3.amazonaws.com/nagudo/wovipupepibis.pdf
    • https://uploads.strikinglycdn.com/files/017ea565-aa7d-486f-9e39-a6ad87c012fd/american_beauty_original_screenplay.pdf
    • https://uploads.strikinglycdn.com/files/a29324f2-10ca-4b2a-853f-2a4322aa377c/2758613714.pdf
    • https://s3.amazonaws.com/xulikamul/warovuzedos.pdf
    • https://s3.amazonaws.com/mutirexa/solasawosoxi.pdf
    • https://s3.amazonaws.com/serogajugomiji/what_does_the_expression_dog_in_the_manger_mean.pdf
    • https://s3.amazonaws.com/donarepemi/18572427017.pdf
    • https://s3.amazonaws.com/baxekojojexusol/gmail_for_windows_7_32_bit.pdf
    • https://s3.amazonaws.com/fosalizuzu/37189717413.pdf
    • https://s3.amazonaws.com/kulinisokakewi/10366608375.pdf
    • https://uploads.strikinglycdn.com/files/aa934140-a9c4-4083-8150-a31be31076e0/xadirobetokujan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012c13.bin
7fb65e0f9423075dd40ce397d3f9124e8327bdfe8d5f8bfce4c6561ee24273f8
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12C13 19176 bytes
font_00_sfnt_off0000f2d9.bin
25c6db64a8601a81db4d7f266d7e3db29d7a5561b2c239a11b6cafdfa4bad8c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 5508 bytes
font_01_sfnt_off000105a1.bin
f2c5f2e365c6f77a5421eb2a2e524bdb4daf61423c18ae150520f05119c86c9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 11240 bytes