Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0041eb41154a46…

MALICIOUS

PDF

88.3 KB Created: 2021-02-17 12:19:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2b4996e123a8e88d472983215bcba002 SHA-1: 3086f43984215882cfd8e753d2cd2ec188db2944 SHA-256: 3b0041eb41154a46946925571d2ea5ebf081adddc3068718afb1450c01857ca9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs point to potentially malicious content, and the document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wix?keyword=dna+%2526+replication+ppt+questions+answers PDF link annotation
    • https://cdn.sqhk.co/nuzifixe/agcxhiC/81487279941.pdfIn PDF document text
    • http://virnet77.ru/992038711930w39g.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/jbk3Ejf/wosaluvalud.pdfIn PDF document text
    • https://tigigedilopufam.weebly.com/uploads/1/3/5/4/135400960/92be618.pdfIn PDF document text
    • https://pimipile.weebly.com/uploads/1/3/4/8/134883166/9625432.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuvikadob/jh00tEp/ronopexokosom.pdfIn PDF document text
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/f366e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/chalo_full_movie_in_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/chromecast_app_for_ipad_free.pdfIn PDF document text
    • http://tovujopojat.epizy.com/elf_bowling_full_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/ramubozowuzabe.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/7108425833.pdfIn PDF document text
    • http://mopezit.epizy.com/nixamaderedagidonibeko.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/shimla_tourist_map.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/bowubuxumanubatatef.pdfIn PDF document text
    • http://ziwejozaz.epizy.com/balu_songs_in_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/movupogulafelupelovo.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/norimevikajowi.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/madarame_boss_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 14064 bytes
SHA-256: d77000fedb998283a077fcbca517a757b74e8cb59dbcb580eb3bedd48fc7a5a3
font_01_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 4368 bytes
SHA-256: 2b49d57d74e15c192cd3e50897a3319586ff81c4e3ac30b1f68f66d619855527
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 10144 bytes
SHA-256: 41983e42a1255841274c83a3ac97a5ea20cd3139e9c2be722cede8b0eceee6b3
font_03_sfnt_off00013ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA4 16092 bytes
SHA-256: 55d5123ea2e30bb0b6c65147a9271c01f8e2f7536e5e1d4b1c7059638f0fddb0

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