Malicious PDF — malware analysis report

Static analysis result for SHA-256 8993100591c1b88d…

MALICIOUS

PDF

76.6 KB Created: 2021-05-09 16:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2cff419c6e7a2bead8c1cc21dcc35324 SHA-1: 4116fb68f62044a32d7410f2409fcf5c89bee8c1 SHA-256: 8993100591c1b88d40b74584a3a7d1cbc789b5f73adc11a2ce805b98c0fdb9e2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=we%2527ll+always+have+summer+a+summer+novel PDF link annotation
    • http://sosuziba.mypressonline.com/21344433210.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/free_bicycle_repair_manual.pdfIn PDF document text
    • https://fologonalufofu.weebly.com/uploads/1/3/4/6/134694067/eb8f4713.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/10245737247.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/xirelad.pdfIn PDF document text
    • https://zidinekolinom.weebly.com/uploads/1/3/4/5/134516346/kisadaxerarabuliniso.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/circular_motion_worksheet_answer_key.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/49537034920.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/attractor_factor_italiano.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/xuwavatekojixaniroragi.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/simple_compound_and_complex_sentences_exercises_with_answers_for_grade_5.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/20187078986.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/gabemodexikofaluviwatuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a243afc-627c-4533-951c-92ccd72eabbd/biochemistry_concepts_and_connections_2nd_edition_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0d1624-68cd-4a92-aa36-ae72bc929cfd/22710729494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548fe5c0-7f07-4612-967e-12646b47c37b/73236707202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64bcf39a-98a5-4161-9bca-7bdb44a2b584/188482971.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_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 5228 bytes
SHA-256: 387b2b5ccbb27963f66a4b7505231163eb866b530ca23f9885b00b41fa2fd16c
font_01_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 11340 bytes
SHA-256: 33490d101b9be2048d46ca3006c459b397eb88df0bacf7693eb917f8eadd09cb

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