Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36c9933c4be9438…

MALICIOUS

PDF

70.2 KB Created: 2021-01-17 13:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 874d321b1dfb048c5b147738dd2a1515 SHA-1: 913d38fe5008a32675cae83e57d1d65c4da4f767 SHA-256: a36c9933c4be943818db085a891712f6aceef27a06aacdacff7c59a6e1c265dc
126 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to host malicious content. The presence of external URIs and a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/aws?utm_term=benjamin+genetics+book+pdf PDF link annotation
    • https://site-1175991.mozfiles.com/files/1175991/81242034748.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/nghgugd/44521833260.pdfIn PDF document text
    • https://cdn.sqhk.co/kugorazig/jdsIG4a/xosopirevimitebaribajatos.pdfIn PDF document text
    • https://site-1176664.mozfiles.com/files/1176664/9092626005.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/bhctdQ9/sopolefegatuxidomoxufujo.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/KaigeWB/detafogipukux.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/gfwhiKY/bekil.pdfIn PDF document text
    • https://site-1252467.mozfiles.com/files/1252467/azar_random_video_chat_application_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/serojimo/jcuLVii/12650253623.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/ieghjaD/viruses_are_not_alive_argument.pdfIn PDF document text
    • https://site-1166674.mozfiles.com/files/1166674/xowab.pdfIn PDF document text
    • https://site-1168145.mozfiles.com/files/1168145/autozone_auto_parts_appleton_wi.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/f4Shgjj/audio_equalizer_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/ihgdidn/17788589108.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxumokuri.epizy.com/51584189991.pdfIn PDF document text
    • http://nesitojogosew.epizy.com/baasha_full_movie_free_in_hd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 5676 bytes
SHA-256: 89e7b34b4bdfc03f20ca8f45f699d3529170e87fd48009675b9ccbc965ee072c
font_01_sfnt_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 2624 bytes
SHA-256: ee78f61f63b891ba570079363b85e0ffbf1b9f913c96fe999be6c5d4bd84270e
font_02_sfnt_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 10928 bytes
SHA-256: 177393598c659f6532bb61df2d6668041dacd35efdb36e499011b3d94305b30e

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