Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c806df26b50d221…

MALICIOUS

PDF

78.1 KB Created: 2021-03-10 08:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbf6e9bbcfef599f39995751c311e400 SHA-1: 5f113dff51c13a5e0e23ecb0ad98869f32401e09 SHA-256: 0c806df26b50d22175246b76ef32ea6b42370b386b82243f36919eea1c498f5d
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

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/aws?utm_term=what+is+the+best+way+to+study+for+the+nclex+pn+exam
    • http://netolenogafa.getenjoyment.net/wu_tang_clan_songs_ranked.pdf
    • http://logorag.22web.org/fulun.pdf
    • https://cdn-cms.f-static.net/uploads/4464323/normal_6040ac3e4d4e4.pdf
    • https://cdn-cms.f-static.net/uploads/4445534/normal_60352228e7791.pdf
    • http://vovodofozufora.iblogger.org/dumet.pdf
    • http://labifovejes.mypressonline.com/2013_honda_civic_sedan_owners_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/midipes/76286541779.pdf
    • https://uploads.strikinglycdn.com/files/1bb07490-671c-4e14-94da-3f2dad19558e/6-2_practice_tests_for_parallelograms_answers.pdf
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_e9d107da86ec4dda8f130bebdee0b3d9.pdf?index=true
    • http://gepowux.rf.gd/android_boringssl_build.pdf
    • https://s3.amazonaws.com/dezajok/cuisinart_bread_maker_cbk-200_troubleshooting.pdf
    • https://s3.amazonaws.com/bidemewufa/android_spotify_airplay_without_root.pdf
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_ca11bf83509a4940b915f55426def995.pdf?index=true
    • http://surobufalinaxis.epizy.com/4262909543.pdf
    • https://uploads.strikinglycdn.com/files/888c7be7-bb97-440b-acfa-d03c1b3f9bf2/negedixowewakemir.pdf
    • https://s3.amazonaws.com/mexijegedakol/bully_anniversary_edition_geography_1_android.pdf
    • http://wuvadik.rf.gd/tafukod.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/womivakawaxavi.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_off0000f19d.bin
b543f6c0a62bfb4d78a42e551164f3be6ec60d063b2b334e617a9b29a4a4a5b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 5812 bytes
font_01_sfnt_off0001055d.bin
6eb374e66ac20558f98d8e6aa0c4f3eaaf8d804bc68445b192dc0ebf809b71eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 10944 bytes

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