Malicious PDF — malware analysis report

Static analysis result for SHA-256 8639e92299dcaac4…

MALICIOUS

PDF

78.4 KB Created: 2021-03-23 02:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dcb104b4bb2f1a54e175b25a8ef289ec SHA-1: cca7d7225229b03e85b00312afc59b4d12db729c SHA-256: 8639e92299dcaac4c0ecfd7ef4d1a4a2e20791dcc67ce0b7c14baff70a33f701
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to malicious sites. The ClamAV detection further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://maypoin.ru/wix?keyword=wall-e+science+worksheet PDF link annotation
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/7730220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369657/normal_5fd9487d965b9.pdfIn PDF document text
    • http://bagutoruramig.mywebcommunity.org/sajixaxibiroxa.pdfIn PDF document text
    • http://ooovseanalizi.ru/87661696634mtpmv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481513/normal_602b6bd05fdaf.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/7165583.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/bank_clerk_english_book_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417145/normal_5fde81143e76c.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/what_time_to_pray_salatul_istikhara.pdfIn PDF document text
    • https://nijolonarezop.weebly.com/uploads/1/3/3/9/133999518/vadedofopalure_maruwuguten.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/43490809995wloo8.pdfIn PDF document text
    • https://sakenudawajaka.weebly.com/uploads/1/3/4/5/134595508/ragamorerikegisi.pdfIn PDF document text
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/8eb13427d1efa.pdfIn PDF document text
    • http://italdom.fun/62358991371pkl33.pdfIn PDF document text
    • https://sipebiwamedewor.weebly.com/uploads/1/3/4/7/134707389/jogerexov.pdfIn PDF document text
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/9b7c140b.pdfIn PDF document text
    • https://vakejijumusefuv.weebly.com/uploads/1/3/5/3/135313512/kademisafiwevisekov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_600d0c91cacba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_85152f7772aa49639366fbb3870ab9f2.pdf?index=trueIn PDF document text
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_402e4d60d1dc46a2827b18112da7085e.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_3448af39dfcf4a17ae25a70ba88cb4db.pdf?index=trueIn 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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 5088 bytes
SHA-256: 53874dd5b222b4a71415e358bd4e24ac19df439e3d95ef17e12b48d2e732538b
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 12024 bytes
SHA-256: 31fcf5f365989a37af160cc8e9adb6b6a95b6dc62ac292bc9c1b01bd8f3d9fcb

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