Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c0d124ca7e3d9d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 11:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5dad6a35b26b8d15c7fb3afb6fb7436b SHA-1: ffe44261dafd9ceadc70260bab4ea8b9423adcaa SHA-256: 43c0d124ca7e3d9dc8e0a430c7a01f1b72fc301dec3cd73d52fb3e7fed712483
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across many domains. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=driving+academy+mod+apk PDF link annotation
    • http://marchmont.ru/imgs/file/duzoroxu.pdfIn PDF document text
    • http://elpijisystem.com/file/fagoxusekugino.pdfIn PDF document text
    • http://indel.sk/userfiles/file/lubemutivudedotele.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/duwuvawubesopeve.pdfIn PDF document text
    • https://sergiomauri.com/images/file/68356789525.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/55882739128.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/37168016308.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/48421509212.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad92c06be---wepologuwunima.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/vokonudufuf.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16130b54b4a5ce---71414574460.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/41399306952.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/zasobenozejefuxegoke.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/20518891486.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/77811823637.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/sufubalosojadi.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/71994552591.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/pezazorafaf.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/79012117022.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/jisazuwilebigefamujix.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/zigaw.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_off0000ba47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA47 10816 bytes
SHA-256: b48f204bfc89805ea417540ccc85359c4adfd6f478f06d853d0f20841f847deb
font_01_sfnt_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 15612 bytes
SHA-256: 072f5441069d90559fcbe1d73712320715e2c1b06562d34497927c056117f3b6

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