Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d04cfe9696dd409…

MALICIOUS

PDF

77.4 KB Created: 2021-02-24 23:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b1ffd4b6da722000bb2464ce5170a9e3 SHA-1: 5cf67571f599374c0e28dca940d587a69df44568 SHA-256: 7d04cfe9696dd409827fa1d275d8694246303686655adcf579d1dc40290adb7a
194 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, designed to mimic search results for academic papers. This behavior is indicative of a link farm used to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/strik?utm_term=antennas+and+wave+propagation+by+kraus+4th+edition+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/lazodadevab/X8PijaN/vegamegironumako.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/jdDgghf/89252580030.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/d6vp2gU/sports_head_soccer_fifa_world_cup.pdfIn PDF document text
    • https://cdn.sqhk.co/rokunufoleti/giBw8Eh/56945111999.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/ijjhgja/madexasuretizujiwogose.pdfIn PDF document text
    • http://volewug.iblogger.org/redundancy_calculator_spreadsheet_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/VvjhShd/temilipepovorunupor.pdfIn PDF document text
    • https://cdn.sqhk.co/vojazodelud/4IVjgUc/best_photo_lyrical_video_maker_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nunologen/Zr0H1uT/banana_kong_hack_2020.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/dijasajuvipofu.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/ifqEghN/pulse_rate_chart_pediatrics.pdfIn PDF document text
    • http://sijojovimem.22web.org/insiders_report_summer_2019.pdfIn PDF document text
    • https://kamukijupekud.weebly.com/uploads/1/3/3/9/133997827/vunedajug_xatexomeluwifi_vodox.pdfIn PDF document text
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/nevunenalozal_redakime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiziwekez.rf.gd/chopin_raindrop_prelude_grade.pdfIn PDF document text
    • http://tivekanudoz.rf.gd/24456263206.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_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 5836 bytes
SHA-256: a82170c8bea4f2925a7b461efd5c64a62346b31cea21ac11a473c43419d2bbe7
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 10824 bytes
SHA-256: b07166830e29e66e122b7aa85411d8144abc5346f953a0515ff2f8f2b961de87

Open this report in the interactive analyzer, or submit your own file for analysis.