Malicious PDF — malware analysis report

Static analysis result for SHA-256 7162bb9a5c7d8d82…

MALICIOUS

PDF

74.6 KB Created: 2021-02-05 10:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6161920812965e6d4a0ab96563367c75 SHA-1: af03d143803c702669282af929b48b79c881307f SHA-256: 7162bb9a5c7d8d821b4ab5b717a75f264a70ad6896a9e796c85551092412ecad
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or link-farming operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, indicating a tactic to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/aws?utm_term=a+i+g+police+full+form PDF link annotation
    • https://vigenuwotefi.weebly.com/uploads/1/3/4/0/134012497/33c617d0cbc7.pdfIn PDF document text
    • http://wodunobogigav.22web.org/nivejosibomoxurabegafew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_6017227464d0e.pdfIn PDF document text
    • http://wazasutosas.iblogger.org/90124790091.pdfIn PDF document text
    • https://sasifebuwanozag.weebly.com/uploads/1/3/4/2/134234849/fotube.pdfIn PDF document text
    • http://wimosam.22web.org/75435295713.pdfIn PDF document text
    • https://zulunapakaf.weebly.com/uploads/1/3/1/0/131070820/d143860d06f690e.pdfIn PDF document text
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/kedukozet-vexakajikubifox-jozuziwimator-dopugenagigasi.pdfIn PDF document text
    • http://zobevewobuka.22web.org/bowuzizo.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/e7725a.pdfIn PDF document text
    • http://xavubizuj.22web.org/nl5_circuit_simulator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496853/normal_5ff3b637b373c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369141/normal_5ff67942cd101.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vosimamasi.epizy.com/fadagasidoro.pdfIn PDF document text
    • http://wumipuxupixak.epizy.com/giwedadakopujudadewo.pdfIn PDF document text
    • http://wekolaxoretewov.epizy.com/waaree_solar_inverter_datasheet.pdfIn PDF document text
    • http://sutakepaxiru.epizy.com/moleskine_smart_pen_user_manual.pdfIn PDF document text
    • http://nagurinetawami.rf.gd/bodyguard_season_1_episode_6.pdfIn PDF document text
    • http://zekarevuwo.epizy.com/entropy_in_information_theory_define.pdfIn PDF document text
    • http://pofikasuvemili.epizy.com/zegaramelerulowawipem.pdfIn PDF document text
    • http://jarunotaso.rf.gd/pugabijelumaneveresa.pdfIn PDF document text
    • http://barukes.epizy.com/63108020885.pdfIn PDF document text
    • http://galapeb.epizy.com/60708816441.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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 4936 bytes
SHA-256: 972d3d8923cdaee3dd9a15d5030185ef35134043608a85908f157b966a2b550b
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 10572 bytes
SHA-256: 20237e8660d72d7c549c7ad00fe523a0fe7bcb526ab078d1cfab663ded2975b1

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