Malicious PDF — malware analysis report

Static analysis result for SHA-256 b309ed8642598c78…

MALICIOUS

PDF

78.4 KB Created: 2021-03-30 09:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb552fe35efa769b893e8961fa64fb2c SHA-1: 2ef30721dfdb3d2b0222c4c2130932f1dda345ff SHA-256: b309ed8642598c78fe1b042443a27bb0f6bdbaf673ef0d577489832293dcbe1d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing operation. The primary malicious URL identified is https://lozipotod.ru/wix?keyword=idle+heroes+stones+guide, which is likely used to direct users to a scam or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/wix?keyword=idle+heroes+stones+guide
    • https://cdn.sqhk.co/gukugifixija/f3muDy4/horse_jumping_games_free_online_no_download.pdf
    • https://cdn-cms.f-static.net/uploads/4464724/normal_60110754e7372.pdf
    • https://static.s123-cdn-static.com/uploads/4427097/normal_5fe548dc77edd.pdf
    • https://static.s123-cdn-static.com/uploads/4420020/normal_60052a6eb9e23.pdf
    • https://static.s123-cdn-static.com/uploads/4463830/normal_5fcc7f021e9fe.pdf
    • https://cdn-cms.f-static.net/uploads/4460057/normal_602f18975fa53.pdf
    • https://cdn-cms.f-static.net/uploads/4466172/normal_603e2aa989ed3.pdf
    • https://cdn.sqhk.co/kakumipoman/oDI6jhA/64920625251.pdf
    • https://cdn-cms.f-static.net/uploads/4494435/normal_600befb09ff8d.pdf
    • https://cdn-cms.f-static.net/uploads/4449000/normal_601b61bd6a90d.pdf
    • https://static.s123-cdn-static.com/uploads/4416140/normal_60038373df672.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad0f3e10-38ce-46e9-91e4-0d7f7dd3dfb8/how_much_is_an_xbox_controller_at_walmart.pdf
    • https://uploads.strikinglycdn.com/files/ab0bdbe1-057b-4704-a006-83211d1ababb/80735992270.pdf
    • https://uploads.strikinglycdn.com/files/34fe59f7-aa40-48a5-bb5b-3de6958cb460/rowawepinosidolodagozuf.pdf
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_4d899a318982405cbce28eb194b8bc6b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d08dad53-caf9-4957-9462-11b72ce473dc/yamaha_kodiak_400_engine_oil_weight.pdf
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_9cf43cd56a4f4ca8bd22db17f45acc0a.pdf?index=true
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_d9a3b4141c3e45d7bb33d001ee507fd3.pdf?index=true
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e798.bin
629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 6440 bytes
font_01_sfnt_off0000f78c.bin
d0f48cefcb27a3f3c78822fd0e2f2deb71af0a4c1b90873c03cbdddd68c91083
pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 4816 bytes
font_02_sfnt_off000107e2.bin
a7c22f11497b907e5da6f620f919e3a4d93112b3d47faa2e9b78a041098aeb62
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10644 bytes