Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7a32fd59037512…

MALICIOUS

PDF

81.3 KB Created: 2021-03-09 19:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba914f2face7a9c192482debf5243b73 SHA-1: 1997948f69beba2615c6eb6deadd0de8e3433a28 SHA-256: 6c7a32fd590375126e9f9f3224bfc91bbc654ae2b7db40388c673e7e3adb0fb7
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to manipulate search engine results or lure users. ClamAV detected this file as Pdf.Phishing.Trojan, and a critical heuristic identified a mass external PDF link farm. The embedded URL 'https://jumiwimov.ru/123?utm_term=windows+7+usb+boot+creator+free' is likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/123?utm_term=windows+7+usb+boot+creator+free
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/4f38d25.pdf
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/tukarek.pdf
    • https://korenumotijele.weebly.com/uploads/1/3/4/6/134687452/rasokowiwokevi.pdf
    • https://tamaxanafe.weebly.com/uploads/1/3/1/8/131856242/pitonefatawofupob.pdf
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/majasedetagupaju.pdf
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/7bba79c5.pdf
    • https://rorupuloloxotog.weebly.com/uploads/1/3/1/4/131409755/98e5a3c69df753.pdf
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/tivukuwozerudin-wametitukukilus-bajomi-zagazur.pdf
    • https://toposizijud.weebly.com/uploads/1/3/0/7/130776562/zaruzofekomod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/midizaxopazeji/tivavefedunejitigiwu.pdf
    • https://s3.amazonaws.com/dupula/2016_porsche_cayenne_hybrid_manual.pdf
    • https://s3.amazonaws.com/tinezedu/dragon_age_origins_mage_arcane_warrior_build.pdf
    • http://sonowodiguvab.epizy.com/animation_video_creation_software_free.pdf
    • https://uploads.strikinglycdn.com/files/4e793512-5d7c-42c7-adf6-a46017bac6f9/59859645381.pdf
    • https://uploads.strikinglycdn.com/files/d0213f39-86bd-47cd-961f-8adb955c0d7c/superhero_mods_gta_5_ps4.pdf
    • http://rojetakaju.epizy.com/how_to_crochet_for_beginners_step_by_step.pdf
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_f4156f9836f24df0a3d7a63dea64dd13.pdf?index=true
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_d608c92489b14617b4a8e6f5e9196891.pdf?index=true
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_e42bda69657a4785864e977c2b08e586.pdf?index=true
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_59436fe0855a42a88ed09102e78a0bcc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b6.bin
fdaa02957b35ea2b93b8b2d2e3774fb2c88e15ebab3cb2e6c0d627352689df87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 5192 bytes
font_01_sfnt_off0001057e.bin
0edf6128e88b4f6d15b52dbbfa19470251b3bdf242c469bfa0e1653589547846		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10832 bytes
font_02_sfnt_off00012a01.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A01 4324 bytes

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