Malicious PDF — malware analysis report

Static analysis result for SHA-256 939b1c447ab4dfec…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 09:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: aec1b843689a0dbd3a96aec2db8684ab SHA-1: f06b556340da2fe2b33a65d80b8d7ba0d9b01986 SHA-256: 939b1c447ab4dfece167ffb60ea350dffcd93af214c0296c544dff68f0824129
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing or trojan. It contains numerous embedded URLs pointing to external sites, many of which are structured as link farms or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://laborke.ru/uplcv?utm_term=grand+theft+auto+v+ifruit+app+download PDF link annotation
    • http://miroslaws.com/ckfinder/userfiles/files/kisapiladufetamozepol.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/93654004545.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/28158915107.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/99333157626.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/jonamulivunomibibod.pdfIn PDF document text
    • https://jurad.eu/files/file/fepakulaxaxebobexidovu.pdfIn PDF document text
    • http://ktcz.eu/files/files/gukuvi.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/82297843924.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/fazexegikikodegab.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/zuguritipekikenurodaman.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/doraseredanivilusilodo.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/38202979963.pdfIn PDF document text
    • http://elma1.ru/!upload/files/jupusitoxubofaronuvuterij.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631521046.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/baleziporenuzagas.pdfIn PDF document text
    • http://caythuocnam.org/images/files/15748403363.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/84824946732.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/aafa7cc3e385f14d9bcc6205e52ea735/rolejinanavofedezu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9deb84144fff0be311cc42e603062bf1/fufogazixatetudexom.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/pevurovuwuvow.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/zugovane.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/jutunabupodoloxuw.pdfIn 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://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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 10720 bytes
SHA-256: 7a515ab4ce5b6cd0aa52e6a9bda66e03afca9418c8c1439cea35b13752ee73fe
font_02_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 17456 bytes
SHA-256: 6d95d48279e264b16db68a06dc5d08a66509d8a4c0fcd1e9a2d8af94b5235af7

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