Malicious PDF — malware analysis report

Static analysis result for SHA-256 34245ffb11caa0f1…

MALICIOUS

PDF

72.3 KB Created: 2021-05-05 07:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4d877c1512068a1fed635fa04641ec2e SHA-1: e791b05fcf3237386cd9b6a8dd153dc06d629ef1 SHA-256: 34245ffb11caa0f1cf04ddbcf073548f7400f04dd92972c8b04dd59af3583e40
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://crophysi.ru/strik?utm_term=gimp+costume+picture In PDF document text
    • https://static.s123-cdn-static.com/uploads/4503214/normal_6001e0624cc95.pdfIn PDF document text
    • http://mofowojadeg.iblogger.org/cs_lewis_the_weight_of_glory_sermon.pdfIn PDF document text
    • https://xorigikaku.weebly.com/uploads/1/3/1/1/131164164/c92660d360.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/79cf5f64c2b47.pdfIn PDF document text
    • http://xewixejixukumes.22web.org/fufaju.pdfIn PDF document text
    • https://pimesawugure.weebly.com/uploads/1/3/0/7/130776266/xikujupowi-gifumid-givegowani-xoboriwimifike.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/ielts_speaking_part_1_sample_questions_and_answers.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/a4e63759d57.pdfIn PDF document text
    • http://gavolav.mywebcommunity.org/luseg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fdf309ec0d74.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/fugaraverikamo.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/jjjctif/number_counting_games_for_toddlers.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/giictjc/37071935795.pdfIn PDF document text
    • http://xekuluw.iblogger.org/tolubinunal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedisijusa.onlinewebshop.net/22650519704.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/regororarutorinave.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/73713240903.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/tubijoni.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/fudaluzalofojota.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_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 4868 bytes
SHA-256: a12077b14590631deb53b0ae22249a47928660dbf541ae4b49516521b3deb09c
font_01_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 10700 bytes
SHA-256: e61c9adf7449abd5ce577207e32e51bde51c4bcbb170dfa8537a2c611813e445

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