Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f3ac7123b8b2c1…

MALICIOUS

PDF

77.7 KB Created: 2021-03-08 21:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7ae5a4849a06bb2e14fe3820d7b5f8ba SHA-1: 19957d10222b20cd009a523744827c4c351857c9 SHA-256: f2f3ac7123b8b2c188b8e4f0ef51dae844a9931833ce359a759cbe8c6c87cc92
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs, with a primary one leading to 'xezojetit.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'comprehension check answer key' and metadata from 'wkhtmltopdf', indicating a lure to a potentially malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://xezojetit.ru/wix?keyword=things+fall+apart+comprehension+check+answer+key PDF link annotation
    • http://tosanigepa.iblogger.org/tawokatudoguz.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/misekadoxaku.pdfIn PDF document text
    • http://wodaretibinusad.22web.org/67674575258.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/nufoz.pdfIn PDF document text
    • https://nunodovov.weebly.com/uploads/1/3/1/3/131380210/wevarejafiz_remurizufajek_nizuda_kamoziruxifega.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/pesakabok-fomotu.pdfIn PDF document text
    • https://dubelaxelafef.weebly.com/uploads/1/3/1/1/131164372/1162167.pdfIn PDF document text
    • http://romeita.fun/lakadesomilevifejofk0ph2.pdfIn PDF document text
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/tameb-dikemen-logoni.pdfIn PDF document text
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/becc49.pdfIn PDF document text
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/1417052.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/71688583089.pdfIn PDF document text
    • http://asia.kiwi/70587835588t5jzd.pdfIn PDF document text
    • https://kapalane.weebly.com/uploads/1/3/0/9/130968981/9107807.pdfIn PDF document text
    • http://redit.fun/what_is_engaging_communicationibjv7.pdfIn PDF document text
    • http://xizamugej.iblogger.org/56996439578.pdfIn PDF document text
    • https://zexamedoguko.weebly.com/uploads/1/3/1/4/131454027/raxutizaxew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowujobosega.rf.gd/baduvilarekusos.pdfIn PDF document text
    • http://dipulitexaxuz.epizy.com/9798008314.pdfIn PDF document text
    • http://dexizijisub.atwebpages.com/femoveregere.pdfIn PDF document text
    • http://fukuselumetu.myartsonline.com/can_you_cook_a_turkey_crown_in_a_slow_cooker_uk.pdfIn PDF document text
    • http://najirukijo.rf.gd/barozavejosebin.pdfIn PDF document text
    • http://fajiwuwigekelal.epizy.com/the_essential_rumi_new_expanded_edition.pdfIn PDF document text
    • http://xabiworaw.epizy.com/the_song_remains_the_same_full_movie_123movies.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_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 5636 bytes
SHA-256: 119484175b5171b7c3244f1f344c2a47691520bfb3034c67cefbe4beca24343c
font_01_sfnt_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 10192 bytes
SHA-256: e04a16997dd352fc4be49d011bad1c0a908c56f7bcbc9ae348efd28d684ec79b

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