Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f313af207950c5d…

MALICIOUS

PDF

67.7 KB Created: 2021-09-19 04:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27a89a1f8c28b39850f5e13d71bdf74b SHA-1: f4a9a519134c4451537cadc3746be2acfb3fd160 SHA-256: 9f313af207950c5de87716be0208a651b89683b4d5fdea2a839cf865e1cc71a4
174 Risk Score

Malware Insights

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

The PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. The presence of embedded JavaScript and a lure technique suggests an attempt to trick the user into clicking a link, likely to download a second-stage payload or redirect to a phishing site. The document body is heavily obfuscated, but the overall structure and heuristic firings point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://frangarcia.eu/upload/file/welujoranazifegepaf.pdf In PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/nokotujo.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/dajibemetumigako.pdfIn PDF document text
    • https://edusfera.pl/upload/file/73618763652.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/28998562409.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad51c67f13---51868111221.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/76858738103.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/51792468088.pdfIn PDF document text
    • https://motoralbini.it/files/file/1409315957.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/budagobetuf.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130200a103cb---dexemutedi.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/xigef.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/21705868259.pdfIn PDF document text
    • http://client.diffuse.info/files/9176271506.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/ledizujirux.pdfIn PDF document text
    • https://songhong.info/userfiles/file/55759588713.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/nurudotijesojuzatevujuvej.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/55209320824.pdfIn PDF document text
    • https://path.mn/userfiles/files/16621911243.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/rifixisedasenudumov.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/78585272848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+websites+to+watch+free+football+streamingPDF 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_off0000ad79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD79 11060 bytes
SHA-256: bba230ad1608d863c3541cb586273a448e99f5c420c349289252c75382cdf4a6
font_01_sfnt_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 13832 bytes
SHA-256: 5af433aafe0dbfdfe7d7b711ec17b9e93c2fa2aa702d938fb0bcca3701c24cda

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