Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb80a178549cc18…

MALICIOUS

PDF

75.0 KB Created: 2021-03-15 13:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8fcaf44afb919cd6cad82c33babcd767 SHA-1: 94ecb6689483ace08c06b67a5b64971258cb316c SHA-256: 6cb80a178549cc189329face1d0355528a6f7ece7d19831bee674b4568a24f58
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=where+can+i+take+calligraphy+classes+near+me PDF link annotation
    • https://popibixa.weebly.com/uploads/1/3/4/7/134745137/vuriwadakesugoruk.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/cnXihgf/ice_hockey_rink_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/dc05rLS/22682579218.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/c5EjjZj/26731410798.pdfIn PDF document text
    • http://kufomabid.mywebcommunity.org/artropodos_unam.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/geFNVkk/13082231544.pdfIn PDF document text
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/numageju.pdfIn PDF document text
    • https://sowovejapa.weebly.com/uploads/1/3/4/7/134709895/tikewowereva_pawomaxuket_wixununijusa.pdfIn PDF document text
    • https://jasugupaxawuz.weebly.com/uploads/1/3/0/7/130740610/konevamofuvevumojanu.pdfIn PDF document text
    • http://tejifepubodol.iblogger.org/27550567588.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/hejgji2/34851422138.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/5816429627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4963ddc2-7256-488e-a373-5d2e67974347/get_the_guy_book.pdfIn PDF document text
    • http://suletemusapiw.rf.gd/47540914873.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_23419e35f18a4db09067c75121963266.pdf?index=trueIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_6098df04abf84f1292b6788e9abcadf2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2e6760-1c15-405c-a2f4-9d655197b9c7/does_target_sell_dehumidifiers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac784c09-33ef-4f9b-a420-78114533412e/samsung_rfg297hdrs_freezer_not_working.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_5c56a5cdbcca41a8be562719640f0ed9.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_off0000e849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 5524 bytes
SHA-256: dca003e151e2e42fdc3c7e2dd28685aa8b9a4044b5252ab2a036db17f85b47b5
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 10548 bytes
SHA-256: 24e73ed868dc4cd7b6f73e9baa7d0c2bacbc26a9f60ae66a6936ba4511c1bc58

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