Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cbbde55de40cd6…

MALICIOUS

PDF

76.1 KB Created: 2021-04-07 19:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a40e8c6bf15c2467d5fdf6a83a361037 SHA-1: 7d7cd8dba760cf8fcf52ccfb622f151f517b32a4 SHA-256: 79cbbde55de40cd684225fe086f2cdb8726a629efe55e068b407652b3ef87ee6
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm, with numerous external links, one of which is a suspicious URL related to 'sonic action figures toys'. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=sonic+action+figures+toys
    • http://dabukim.mygamesonline.org/industrial_applications_of_lasers_john_f_ready.pdf
    • http://dafusunefu.iblogger.org/30920744821.pdf
    • https://cdn.sqhk.co/zunesunatiri/u1gfhgw/fekilobodozofiwam.pdf
    • http://vajujikelo.22web.org/gobovokisokufazosop.pdf
    • http://gapagal.mywebcommunity.org/the_i_o______allocates_the_devices_control_units_and_channels.pdf
    • https://cdn.sqhk.co/saboretiki/zjh9gej/musikizozugo.pdf
    • http://rakomakefike.iblogger.org/geometry_triangle_theorems_and_postulates.pdf
    • https://cdn.sqhk.co/tekuligote/an1S69K/vifitejonegatuselimovu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvarelo/30703030126.pdf
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_e8d793a9c3ab4981b7884300992d82ed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f30fe4e0-8a18-4ccb-9555-ad35d814f806/pimurabatidilixetida.pdf
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_cfba9d9b71634f1aad18e3a12addf3a4.pdf?index=true
    • https://s3.amazonaws.com/gofiguj/lukax.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/zisafuronameboxe.pdf
    • https://uploads.strikinglycdn.com/files/7f06881e-1ab2-4ec6-b706-d89ce48b2710/27596698374.pdf
    • https://s3.amazonaws.com/vidadaviwal/59206766926.pdf
    • https://uploads.strikinglycdn.com/files/a7a369d8-cc38-445a-823f-e3f821f6cb07/43727674426.pdf
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_4d71696340234c00bbe2c76bb4de1593.pdf?index=true
    • http://xuraperen.epizy.com/97464933446.pdf
    • https://uploads.strikinglycdn.com/files/a84d7880-245d-47ed-bd0f-4158eb07918a/how_much_fiber_in_a_medium_sweet_potato.pdf
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_3d2cfcfe8034450a822ed2c618035fd6.pdf?index=true
    • http://xubomegixabax.epizy.com/fisher_paykel_double_drawer_dishwasher_reviews.pdf
    • https://uploads.strikinglycdn.com/files/c47e65ad-8995-4c3a-8a0f-a66f8904370e/8224602091.pdf
    • https://s3.amazonaws.com/doxifuba/pamiribugax.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec25.bin
b474ac10b0bfb6842c7b70713e2c6b75ecdc5cf95f95dca9e9dd07c58fe3739e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 5220 bytes
font_01_sfnt_off0000fe08.bin
a6f1c0d3ffcdeddeecc5f5756c094aa104fa1216e4a987b15d8042db0298c433		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 11152 bytes

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