Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ac1c6973a25b7b…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 09:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76a592edbddd9f31b8da0d96ad720756 SHA-1: 4bb044441f68288b5e47bb58b7756bf4926109c5 SHA-256: d1ac1c6973a25b7bf37572c566aaa9443c468ef8c12f9304734282e30d6a5ebd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's an image-based lure designed to trick users. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a click-outward action and the document's small size further support its use as a phishing or malware delivery tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://delfosventures.com/userfiles/files/87588841202.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/7976516421.pdf
    • https://ismet.com.br/ckfinder/userfiles/files/ralabelegasin.pdf
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fegexudunulefisejom.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/libajurabefe.pdf
    • http://rockpapersun.com/upload_mce_image/file/70607832050.pdf
    • http://theheavent.com/userfiles/files/96493147958.pdf
    • http://frankifoto.com/uploads/pages/files/somofowabijisoj.pdf
    • http://hcvitamin.com/webroot/img/files/40570544397.pdf
    • https://dveropolis.ru/upload_picture/85647929168.pdf
    • http://jeyadhurgatemple.com/userfiles/file/kudoli.pdf
    • http://dotykbylinky.sk/_subory/subory/7419384589.pdf
    • http://imhome-listings.com/userfiles/files/14528276928.pdf
    • http://thermogroup.ru/uploads/files/gazawamamogok.pdf
    • https://rosanaalvarracin.com/userfiles/file/13671862835.pdf
    • http://twfindia.in/userfiles/files/jurur.pdf
    • http://uptownfallschurch.com/uploads/files/93704890807.pdf
    • https://4wheelchile.cl/admin/uploads/file/fuxabidanu.pdf
    • http://dglytbt.com/upfolder/e/files/20210913082454.pdf
    • http://123podkrovie.sk/editor_uploads/files/duzaduxejulonuseg.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/77061113861.pdf
    • http://primaria-ciocirlia.ro/media/file/74073578452.pdf
    • http://car-zone.sk/data/data/file/37772433701.pdf
    • http://wawabed.pl/uploads/userfiles/file/mosabegefolet.pdf
    • https://foodsafebox.com/ckfinder/userfiles/files/fafimajaganesi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=screen+rotation+control+pro+apk+download
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeae.bin
e80f8b786eec1ade2dd95bc11e22c4f2153e6399f4ebd45a9395ad8e4c247c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAE 14356 bytes
font_01_sfnt_off0000d28c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 16792 bytes
font_02_sfnt_off0000eaa3.bin
0d652c6359671f299fecdba0737935b5457bfae072b75506c12db610d99bf5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 10592 bytes

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