Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d918c66924f5fe…

MALICIOUS

PDF

76.6 KB Created: 2021-03-20 04:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2697af1b5f8457dface001600dc69737 SHA-1: d0b50235b7f45039b0b53531553653eaafd6386d SHA-256: a7d918c66924f5fec20cc9b3d4e7a1d257cf33d916ecb2754090245b9e64ff62
156 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 are SEO-themed and point to other PDFs, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://soxebez.ru/award?keyword=statistics+for+dummies+2nd+edition+pdf
    • http://wogivodugakovek.mygamesonline.org/ascii_unicode_table.pdf
    • https://cdn.sqhk.co/gobuwovuv/jb5hc0V/zavelezonewow.pdf
    • https://cdn.sqhk.co/mojazejo/IXghhie/indices_bursatiles_del_mundo.pdf
    • https://cdn.sqhk.co/dawafawux/jdHihii/carried_interest_loophole_tax_reform.pdf
    • https://cdn.sqhk.co/moturalogupe/jhhfQje/goralifabunelevupamip.pdf
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/votuzuzaz.pdf
    • https://bizutimuja.weebly.com/uploads/1/3/3/9/133999747/rugaf.pdf
    • https://kepijifawobi.weebly.com/uploads/1/3/5/3/135388201/walediru_sivunikab_daxorevukizovod_zefekabojitugu.pdf
    • http://zanodopowe.sportsontheweb.net/nofaxodufikinosegugol.pdf
    • https://cdn.sqhk.co/nosimasiv/lFgjhdm/37843100082.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/suzujewa/5460412116.pdf
    • https://s3.amazonaws.com/memobofilenabon/chikku_bukku_railu_video_song.pdf
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_66dc5f27d66e4de79aa4d2fa49f2be3b.pdf?index=true
    • http://sukokovevaz.atwebpages.com/cambio_climatico_y_consecuencias.pdf
    • https://uploads.strikinglycdn.com/files/df371067-6fdb-44d3-aa96-7a48c8c9f4ba/29905145322.pdf
    • https://s3.amazonaws.com/pajukovuxetu/axial_piston_pump_working.pdf
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_27ac451138de4b9e9db81641889d5041.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0409e44e-9872-45d6-b224-3b231fa638a9/57427627362.pdf
    • https://s3.amazonaws.com/rogugagatuf/35642492956.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_off0000ddb8.bin
417b0d87af4ae901aff6355854f19d8f79865c14928a69f06c3c42d612c69f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 5388 bytes
font_01_sfnt_off0000efdd.bin
11b42b68eb6afeea4019718eb40334fdb2fd095ca0c0eb32280e82d8b9d77093		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 11716 bytes
font_02_sfnt_off00011723.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11723 4324 bytes

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