Malicious PDF — malware analysis report

Static analysis result for SHA-256 46dcb28b3eb14bf2…

MALICIOUS

PDF

68.9 KB Created: 2021-03-16 01:37:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b025525272667e4539b002f6f6950331 SHA-1: c030b3614500bcb10b8a010663a2691c1cf7c3e7 SHA-256: 46dcb28b3eb14bf2172dfcb085052c2ffcfb7d1c8e498457f0c75f89682891ce
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a prominent one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=tales+from+the+loop+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453718/normal_6037376721762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459776/normal_5fe241ead8abe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404966/normal_5fecf19593ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_60302bd4d0952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_60415bc0049ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_603bdab985af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495526/normal_603130877fc26.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/runazoxo-tirufozovixob-xegidufotun-xokenenefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_6009b4805a240.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/corporate_strategic_planning.pdfIn PDF document text
    • https://jigugupidutugi.weebly.com/uploads/1/3/0/8/130813301/c7502bd2eae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487916/normal_5fcc8d0e13a09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369656/normal_5ffa4ef54c9bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_52aebf7d699345dcb6158d7870d0d0aa.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_e09d7b14fb2b4502ae6b56a74dfded09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/wevole.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/bevuro.pdfIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_0bd2215ce0c94f02b5deb1ed75e50930.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/bonuposazadurexasemuw.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/ximiketokifofojanunus.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_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 5324 bytes
SHA-256: 4f602b7f1ff0c91e562cb124f947676d4c4d70a145cef17b31902f85d635b52a
font_01_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 11092 bytes
SHA-256: d1abdc72786fb6c8d8e8d7f68da4509411e9b385c56c6c2df079e3995e2239e6

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