Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ddf453e2dd75ee…

MALICIOUS

PDF

79.5 KB Created: 2021-03-20 11:07:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeb2053eeae30066a7f80fd88df8cd7d SHA-1: 21cdf4e50493879d7251c5ed4c56d2a2140ef4cd SHA-256: d8ddf453e2dd75ee22ff2c2aef2460fc3cae18ae21a4fa9c44f53ad3258169bf
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-optimized to appear as legitimate documents, a common tactic for link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=architectural+working+drawings+book+pdf
    • https://cdn.sqhk.co/kagawupatow/CuBu4ic/19212000534.pdf
    • http://osthondroz.com/manhood_laura_dodswortheqy7q.pdf
    • http://krokoboko3.xyz/dyson_v6_animal_extra_manual55w2y.pdf
    • http://felesatediz.medianewsonline.com/gikuz.pdf
    • http://presente-top.store/62470286634bj9oo.pdf
    • https://cdn.sqhk.co/zotenejek/hFhitgN/cadena_100_madrid_direccion.pdf
    • http://wordsidepost.top/pawaxofuwivovamel6pjr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8af7b3ef-3c89-442f-9751-e005970c2452/gojupebumopufotudoxopa.pdf
    • https://s3.amazonaws.com/limepusotanal/cuando_las_cosas_malas_le_pasan_a_la_gente_buena.pdf
    • http://disoluje.myartsonline.com/average_salary_compliance_officer_dublin.pdf
    • https://s3.amazonaws.com/wefemabeni/bazaar_band_mp3_song_download.pdf
    • https://uploads.strikinglycdn.com/files/2043cba8-0c6e-4279-8b66-88049c51198e/buxebawegekuwarekuwevuv.pdf
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_6f065e519a8a4fc59418d4300d59f2d6.pdf?index=true
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_12f8deb19f17498ca77bb86ee1e448dc.pdf?index=true
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_ec2f38a1556c4d5cbaf944d80b1f5a80.pdf?index=true
    • https://s3.amazonaws.com/farezelof/asus_chromebook_c223na_android_apps.pdf
    • https://uploads.strikinglycdn.com/files/8896f13c-2b2c-4a7f-b1c5-c166890899cd/panasonic_lumix_fz2000_price_south_africa.pdf
    • https://s3.amazonaws.com/jiwisigetizoxif/sojukumego.pdf
    • https://s3.amazonaws.com/dazifozixawus/64627747513.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_off0000f919.bin
2f93ab49190d58aa78e592489ab4aa52c9d7857403cd8ed5edd2d83a40ce3f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 5700 bytes
font_01_sfnt_off00010c87.bin
aa6f685f8abeb56360ca24191e59e47ef5a385b992bd16ff44436f2c5f03318b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 10660 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.