Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7d5d22a1648518…

MALICIOUS

PDF

67.4 KB Created: 2021-10-01 02:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ccb2666c3a2f59edd9d9c095dbd7605 SHA-1: 2e2f1ccce6aff3d2519d07017ce080af0bde9003 SHA-256: fe7d5d22a16485183a96e3952177368e81444405b3ebebab66b2191687e9d106
146 Risk Score

Malware Insights

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

The PDF employs an image-only lure, a common tactic for phishing or malware distribution. The presence of numerous external URIs, many on disposable hosting, suggests a link farm designed to obscure the ultimate destination or to host multiple lures. While no scripts were explicitly extracted, the PDF structure and the ML classifier's high confidence indicate malicious intent, likely leading to a phishing page or a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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 67 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 https://archism.ru/uplcv?utm_term=pubg+mic+voice+changer
    • http://uniroll.pl/user_images/file/45734994370.pdf
    • http://7m-shop.com/userfiles/file/87374232763.pdf
    • https://mobisteelegypt.net/userfiles/file/33639607145.pdf
    • http://tonyprins.nl/images/uploads/file/sikusidubasazip.pdf
    • http://marchmontnews.com/imgs/file/96317274934.pdf
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/nelapupakuti.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/5420171875.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/wunotovabejuden.pdf
    • https://tonerihned.cz/userfiles/file/97063041419.pdf
    • http://savvyais.com/userfiles/file/japewonesikinif.pdf
    • http://urgentcarepb.com/userfiles/file/94878726398.pdf
    • http://klhl.com/userfiles/file/sajixut.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/di9djg25b479moja993e9oe412/jigomusozu.pdf
    • http://www.s4b.nl/upload/files/13274941256.pdf
    • http://kerrya.com/ckfinder/userfiles/files/65421156000.pdf
    • https://valubil.com/public/uploads/cms_file/cms_files/pulonuvusobuvogilojovawep.pdf
    • http://friulanapanini.com/images/file/29899965346.pdf
    • http://menifee.hanasushichoice.com/uploads/files/86128264564.pdf
    • http://emanuelarombiarchitetto.eu/userfiles/files/zugorigivoguk.pdf
    • https://astoraccessories.com/uploads/ckfinder/files/10223587917.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/67101286069.pdf
    • http://hebakotb.net/userfiles/file/gedawokulujis.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/tireweke.pdf
    • https://metrosecuritynepal.com/assets/userfiles/files/36501530111.pdf
    • 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_off0000adab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADAB 16792 bytes
font_01_sfnt_off0000c5bd.bin
1f832bb31b74c95b8a01069d0701cf58a55437deb477c5bc26748da2d8db3f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 13700 bytes
font_02_sfnt_off0000e7bc.bin
a7868644121d1ab6d66edbb5fc4f82c46b65d58a00587a70e6bff505fdfdec64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 10672 bytes

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