Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa421e020e1749ab…

MALICIOUS

PDF

88.4 KB Created: 2021-04-02 05:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8ddaabef2302480f092a4a669d01c8d0 SHA-1: 7c28e4e54be75ef4a6d67e9ee3b9ccf56283aa07 SHA-256: aa421e020e1749ab9f0524f54ab23e321b6ccf2268cc01cc989f9da45778a83c
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with a high-confidence detection of Pdf.Phishing.Trojan. The presence of multiple external URIs, including one hosted on disposable infrastructure, suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'disclaimer audit report pdf', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/award?keyword=disclaimer+audit+report+pdf PDF link annotation
    • http://mizusowe.66ghz.com/video_recorder_for_android_apkpure.pdfIn PDF document text
    • http://tinipen.medianewsonline.com/56655390861.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/Fopgejf/gravitrax_pro_expansion_vertical.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/aKbGjhJ/wedding_cake_decorating_games.pdfIn PDF document text
    • https://cdn.sqhk.co/laxuweredex/gjdjiic/automated_guided_vehicle_accidents.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/fZjigjp/66777407941.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/htgdgjy/chicken_drumstick_template.pdfIn PDF document text
    • http://hookup750.website/71177377496faul6.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/gahgjhG/mepugotebonimulidenamero.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/jfjiz7K/24867704271.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/annotating_windows_10.pdfIn PDF document text
    • http://dkmz1.club/arguably_hitchens3mh1e.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/4hgp6JU/nogutasew.pdfIn PDF document text
    • http://bekavukida.22web.org/canon_pixma_pro_100_how_long_does_ink_last.pdfIn PDF document text
    • http://winoorama.space/tchaikovsky_symphony_5_horn_solo_sheet_music6qnn6.pdfIn PDF document text
    • http://all-system7.work/raxipupotevafojv5gr.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/bodikomaluk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/when_did_the_3rd_agricultural_revolution_start.pdfIn PDF document text
    • http://nabunuwo.epizy.com/9671766070.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/adobe_indesign_cs6_free_softonic.pdfIn PDF document text
    • http://pekufupudemolor.epizy.com/pozokofigilumozikurozu.pdfIn PDF document text
    • http://noxudovo.rf.gd/21375331583.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 5300 bytes
SHA-256: 1093c04dba76f9cdcf37bbc6b8e2fa400e58e5545cbf810befd5ec03b0effa5b
font_01_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 11732 bytes
SHA-256: f55c5316312d265129d185c7956b9846da877fbac3bd527e0385102055c6ae0f

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