Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e21b2eab851a6b…

MALICIOUS

PDF

71.9 KB Created: 2021-02-18 13:30:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0b61e9fd537ad6e935e442e682adf7d8 SHA-1: 3117cbf0cf25d4a36f9bf44f5308769f819e006f SHA-256: 13e21b2eab851a6b46cd69c0d9d376b2c574db836929188400584db0fa4cd6ec
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=using+dashes+worksheet+ks2 PDF link annotation
    • http://mazanatur.space/seletezosopasusunn5d9.pdfIn PDF document text
    • http://fullhp.info/lusukikumulifilebujhfl7w.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/ihc1pgd/74129059387.pdfIn PDF document text
    • http://magnetfix.store/pumuwugirurugorazujortc7gf.pdfIn PDF document text
    • http://verenica.net/artificial_intelligence_companies_in_americau0n3j.pdfIn PDF document text
    • http://peludofnor.fun/hp_officejet_8600_plus_printer_setupmi2nv.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/finding_the_area_of_irregular_shapes_worksheets.pdfIn PDF document text
    • http://tiktokfrance.fun/49779095555ev3vl.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/geQup6C/street_fighter_super_fighter.pdfIn PDF document text
    • http://boldly-grow.com/white_tiger_masked_singer_revealed4dssg.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/ULoiihe/hockey_manager_19_2007.pdfIn PDF document text
    • http://world-wildshop.com/87579374406jn1qu.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/1vHCjee/rpg_games_online_2d.pdfIn PDF document text
    • https://cdn.sqhk.co/wivodojeg/O4WSIjd/township_game_mining_tips.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romudiforexove.epizy.com/bobabejakobezedogeg.pdfIn PDF document text
    • http://rofizamomu.rf.gd/boostspeed_full_version_free.pdfIn PDF document text
    • http://pujukejesoteja.epizy.com/south_movie_new_hd_2018.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 5332 bytes
SHA-256: a596d617c5d16317501716ecbe500821174ec559d5421e124d48d79204beabb0
font_01_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 10456 bytes
SHA-256: 8dba65d392bf651a6a9ab3fafa0f2b1e73f8e809ac217b770b1633f9e48cb111

Open this report in the interactive analyzer, or submit your own file for analysis.