Malicious PDF — malware analysis report

Static analysis result for SHA-256 85532c43d0de6911…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 20:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bb197c741b910cdc91cdf57d99e63a3b SHA-1: 461080214e6fe8dce5def76f071d265c715e4ece SHA-256: 85532c43d0de6911adebd1a4ccf4481ff2fdd6dad49ab989b081d4f876e69aef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a likely phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=series+french+streaming PDF link annotation
    • https://inprovitperu.com/ckfinder/userfiles/files/gedigamuzunis.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/legarigur.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/60862436107.pdfIn PDF document text
    • http://cartopack.com/Images/file/jozezosona.pdfIn PDF document text
    • http://allier-genealogie.org/File:/fixapuruberufe.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/2852791020.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/zudanij.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/30238039825.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/puwofuvexogaf.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-15/210915134320919891kv9pf2l4esah.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/durokigibonutir.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/mumupuxikupo.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/53600236348.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/54370782099.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/50677433476.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/vivojopojadefofujel.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/46542942768.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410eb6c8b01---wanuwodegalevuxofozed.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/99277491197.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/xusodezuvolavewulerosawi.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/razoxafidadiberaxigosu.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/11071019500.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/75485681321.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_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 19160 bytes
SHA-256: 7b5fc5346043da618caffd6e4f940e71de1488db7436c8dba5b6cd493c43f12e
font_01_sfnt_off0001266c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 10692 bytes
SHA-256: 8b1209881591730c4019135a0a2c0f1dc9ce0fc9ec4ba1e243acac7c200850e0
font_02_sfnt_off00013ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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