Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19d5c9a89cc018c…

MALICIOUS

PDF

71.8 KB Created: 2021-05-04 01:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b9a0104d6a2d9fd315bd6989ee9c09e SHA-1: db658b3e8f9ffcc1028af39a4b8a48ab71564fb1 SHA-256: e19d5c9a89cc018ce2d22a8a15da5ef9650cfd4327363b5ae4346d205c46f423
196 Risk Score

Malware Insights

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

The PDF contains multiple external links, including one that appears to be part of a link farm designed to boost SEO for malicious sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the presence of commands like 'powershell_commands.pdf' within the document text, indicating an attempt to execute malicious code. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nipisod.ru/strik?utm_term=is+the+bank+open+on+a+sunday
    • https://vefigemeg.weebly.com/uploads/1/3/4/3/134368147/kijorepiv_xunoz_jamam_jemurifosiw.pdf
    • http://it50off.pro/keylab_61_mk2_manualrr3r1.pdf
    • https://cdn.sqhk.co/weruvewo/ie3ZYij/gnomes_garden_3_achievement_guide.pdf
    • http://watertea.space/51043203295ninib.pdf
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/d3a64.pdf
    • https://cdn.sqhk.co/nasanoroge/3hgI9fH/glueing_acrylic_sheet_to_wood.pdf
    • http://com-signto2.xyz/nixutulofovew7mbr8.pdf
    • https://cdn.sqhk.co/jubawiwa/BPgegfj/real_boxing_2_apk_mod.pdf
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/baxupipe.pdf
    • https://sebikiwar.weebly.com/uploads/1/3/5/9/135962157/8326402.pdf
    • http://sparzha.club/what_kind_of_oil_filter_does_a_2009_toyota_corolla_take5ntq5.pdf
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/0b30bb0.pdf
    • https://cdn.sqhk.co/tuzevawu/ibggRUL/44171014871.pdf
    • http://it50off.pro/keylab_61_mk2_man
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e1664204-3d9e-4c9c-a071-eee1a2ac0f6e/pezomeruxebukade.pdf
    • https://uploads.strikinglycdn.com/files/94e7fb4a-69ea-4ac7-b1de-247928433863/twentieth_century_harmony_by_vincent_persichetti.pdf
    • https://uploads.strikinglycdn.com/files/1691da32-9f97-433a-88df-cb507a734bd4/star_wars_d20_saga_character_sheet.pdf
    • https://uploads.strikinglycdn.com/files/1f81c36c-505b-4ea4-93f5-a1d3dd035cfb/win_10_powershell_commands.pdf
    • https://uploads.strikinglycdn.com/files/af02ec1b-09f5-4a45-8447-4777728b31c0/libro_de_historia_de_quinto_grado_de_primaria_paco_el_chato.pdf
    • https://uploads.strikinglycdn.com/files/4dc5012f-63f3-40e1-84a0-c81ac32a1f80/dideritumenitiposof.pdf
    • https://uploads.strikinglycdn.com/files/2ffc8749-5eca-47c0-bf7d-fee0c1099ca7/93379070948.pdf
    • https://uploads.strikinglycdn.com/files/d829c98d-e678-4d97-98de-3380abf68b74/lugisakezason.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f2.bin
6d37ed2760ac444501a0855deb43dd6a91da98cec7466e87b6cec66b2bba66db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 4996 bytes
font_01_sfnt_off0000e2d9.bin
6734cb1a12526b71c7489ba80fd288417147016092ee92daf3defefd202de036		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 9780 bytes
font_02_sfnt_off00010460.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 4324 bytes

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