Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45ee543944349a2…

MALICIOUS

PDF

76.3 KB Created: 2021-03-31 22:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3671809e0b83965876acc4fc1bcd2c49 SHA-1: 7cacfdd57e977a4537416da3f4287f2339ed3f3a SHA-256: f45ee543944349a242e879fe2ae626afddc32a2dcf9b103d06de4cd52b6ac512
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, suggests a lure related to file conversion. The presence of numerous external links, including a "link farm," strongly suggests an attempt to manipulate search engine results or redirect users to malicious content, aligning with phishing and SEO spam tactics.

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://nipisod.ru/award?keyword=bmp+to+pdf+file+converter
    • https://jubagimijan.weebly.com/uploads/1/3/5/3/135333733/9a4857d319.pdf
    • https://zopokobo.weebly.com/uploads/1/3/1/3/131383813/1870938.pdf
    • https://cdn.sqhk.co/sepokafaru/ierjdw5/funny_pictures_orange_hair.pdf
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/kizalejamonebukewati.pdf
    • https://cdn.sqhk.co/bapuwanuvadi/P1M5Iii/cake_bunting_printable_template.pdf
    • https://nexiwurepefisov.weebly.com/uploads/1/3/4/3/134372078/pufona.pdf
    • https://lozexisivebuzon.weebly.com/uploads/1/3/4/7/134702594/lofirosotutana_vatexijagisim_taxavusemasezid_mezuworik.pdf
    • https://cdn.sqhk.co/gasosivifug/bbfiycd/zombie_wave_shooting_game_mod_apk.pdf
    • https://xexajuxeleseg.weebly.com/uploads/1/3/4/5/134592224/maxib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_2d8ef9bc90914868a4014f6614d48c20.pdf?index=true
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_618a301769c543b59b159bb907759f00.pdf?index=true
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_c665d0cee98f4d40943fe9457954c905.pdf?index=true
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_7733b3166f8b4957af5227f836a9a408.pdf?index=true
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_91f8d13dd3a64fab8e8ee90029b4a384.pdf?index=true
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_2a4758e6421b49cdae0ea5d552ee75a0.pdf?index=true
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_c5d6a75bd35a41ee9fe7872511069526.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebc.bin
601e27360b2ff3ae322b1922e312d080ce1ef3cfad426bd48427d8914ebabfc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 5024 bytes
font_01_sfnt_off0000ffcc.bin
26265d05cd7cfdaa50b5a2a9c01514484281b3e94d528091962deba90dc049b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 10644 bytes

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