Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f376533fc28fbda…

MALICIOUS

PDF

107.7 KB Created: 2021-04-05 00:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 849febca79356ffa44a10cf45563d550 SHA-1: c90b2b6642c91cbc389b1733e8da52564c403bbf SHA-256: 9f376533fc28fbdae87f100d7ae053d9f3a8e0494a893b3f7ebbfb8ce4b5668e
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to attract traffic. One critical heuristic identified a link to a known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/aws?utm_term=five+nights+at+freddy%2527s+3+play+free+online+games In PDF document text
    • https://turoliletipusu.weebly.com/uploads/1/3/5/9/135969349/5653515.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/7d15ef6aa7cba19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_605300ec6d6fe.pdfIn PDF document text
    • http://grigolia-studio.ru/75897107289lc5tz.pdfIn PDF document text
    • https://besikutusesa.weebly.com/uploads/1/3/2/6/132681218/8eeb89027884.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/7a63d0babc1.pdfIn PDF document text
    • http://hookup158.fun/gazojalixazokuzozunz7lm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408188/normal_5ff27798da33a.pdfIn PDF document text
    • http://zofapojofiwifi.iblogger.org/charles_chapman_pugh_real_mathematical_analysis.pdfIn PDF document text
    • http://raffle.website/zujakovewuz6f9x.pdfIn PDF document text
    • https://zifosugelupoz.weebly.com/uploads/1/3/4/6/134693972/dosorupetodow.pdfIn PDF document text
    • http://goloturasituj.66ghz.com/vipelikubaboxifamexa.pdfIn PDF document text
    • http://freshnatur.fun/23583744415kx393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_6025065678f20.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/d7a07e5b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_3c0cf8c8256040ad924d133bdb285c28.pdf?index=trueIn PDF document text
    • http://wejivitekep.epizy.com/how_much_is_it_to_get_unlimited_data_for_att.pdfIn PDF document text
    • http://mafakizukizunof.epizy.com/xazazusirapatetakepit.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_d5baed6fab0e435c94c1118646d3b12f.pdf?index=trueIn 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_off00016634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16634 5772 bytes
SHA-256: 9b6c5d85de7c806773c8ad958b5317128d3d5efacf46082069f114f01f88dc03
font_01_sfnt_off000179d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179D3 11656 bytes
SHA-256: 8b9fb9a328a22b725f9b676e66a991ec4ce517ebc3d2d0decb3862b3a556875c

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