Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1173a0ebab03b87…

MALICIOUS

PDF

72.4 KB Created: 2021-02-12 17:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5c5632565f52b5418fa2faf73acf8e2e SHA-1: e39f1002d3875cfe7f14255b540cabf81c22ed3e SHA-256: e1173a0ebab03b87a213d4cc196be794fa28c31474418f7397d9f9fcd7aaaa41
156 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 of which point to other PDF files, suggesting a link farm or SEO spamming operation. One of the embedded URLs, 'https://bologen.ru/123?utm_term=skyrim+throw+voice', is presented in a way that suggests it's a search result, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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 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.
  • 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://bologen.ru/123?utm_term=skyrim+throw+voice PDF link annotation
    • https://sixewamunid.weebly.com/uploads/1/3/4/4/134472099/jaduvam_livototel.pdfIn PDF document text
    • https://putumilaw.weebly.com/uploads/1/3/1/3/131380263/39006903b95081.pdfIn PDF document text
    • https://cdn.sqhk.co/zizaratijiga/jhghOhi/hop_step_jump_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/60sheVY/44546110731.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/pA9jggd/94914096969.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/d1jerBX/40794039619.pdfIn PDF document text
    • http://centerverifybadge.com/facility_layout_and_location_francisb98lp.pdfIn PDF document text
    • http://gravkamen.ru/free_visiting_card_psd_templates1bucr.pdfIn PDF document text
    • https://cdn.sqhk.co/dosiloxof/krhgnjg/antibiotics_for_common_respiratory_tract_infections_in_adults.pdfIn PDF document text
    • http://clobuss.ru/sun_news_live_today_weather_report2fmon.pdfIn PDF document text
    • http://dressnbuy.com/kobaxuvojaduniwopanazesbrfl.pdfIn PDF document text
    • https://romigugegis.weebly.com/uploads/1/3/1/3/131384185/buzuk_zekuk_kigotufusi.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/eighdii/muzasanojalereroweliwimup.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/Zheghjb/16287682112.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/b26957474b3e.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/isk24gj/31450555733.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/kujapomib/80789401470.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/gojuxoxibusejeku.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/bibaloma.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/isosceles_triangle_worksheet_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/vepurejazezuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/xifudaj.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/converter_to_word_offline_software.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_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 5040 bytes
SHA-256: bbd999ab2acddfeaae8b7065673c85fe054bb0e7fe338fe86cbb8d3e017f3bf7
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 10812 bytes
SHA-256: fcb388f66fbefb5ca9b50db43b06e452456f1a3e2ceded2ffba8289b91bcd9b1

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