Malicious PDF — malware analysis report

Static analysis result for SHA-256 1635c2a0be97ceae…

MALICIOUS

PDF

109.2 KB Created: 2021-09-18 06:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cc8e280d9f21c85380db8d3c30d2231b SHA-1: 2751181ca38aa3adc17e67daf2cf15fc5750afd9 SHA-256: 1635c2a0be97ceae11ddc13f1e3d88fd4bedbb9b1d31a2cdf67553e7d29fb5a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and links, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded links and the 'ML_NYX_PDF_MALICIOUS' heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://vce34.ru/attachments/file/nakakegizedu.pdf In PDF document text
    • https://sadhankendra.org/erc/media/xodunubu.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/roninapapojubamuruz.pdfIn PDF document text
    • https://fultoys.com/userfiles/zebokovagiji.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f570dbe7b9724810b0de0fdee6ec148d/55626641915.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/99490014977.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/dizadamijokuwozelonop.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/fedaxalatulogatofa.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/79112385325.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/muzupefuteg.pdfIn PDF document text
    • http://fitviewer.biz/files/file/doxijeloxegigega.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/rotosute.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/4090376821.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/40587408349.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/voxepokumusebib.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/37965648875.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/tiremunufasudapi.pdfIn PDF document text
    • https://mkart.it/uploads/file/29405522626.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/17070166531.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/nijirisaxosodugobalu.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/36977703915.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/taxalosezeguxe.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/zupofuwapabituxogudazuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+legend+of+zelda+breath+of+the+wild+art+book+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F12 10952 bytes
SHA-256: cc76fd88bc0a0cd8113ebfa37c58d1b8bd8a59871a52c671fe397ab98fc44bc2
font_02_sfnt_off00017806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17806 17948 bytes
SHA-256: 0eb98442f577aaca3308d38cde5a95df2cb62109696ba321cae16df220d686b7

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