Malicious PDF — malware analysis report

Static analysis result for SHA-256 701d4bc726e001fe…

MALICIOUS

PDF

78.8 KB Created: 2021-03-26 07:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 00b33620cf8e35c9b279d748aa3b332a SHA-1: fa46a3bcdccf3f5a8edd5081e9db1d345b3a2421 SHA-256: 701d4bc726e001fe4f95984599d1532730dc909b5fe13c0616188976e286fe50
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, suggests a lure related to learning German, which is likely a pretext to drive users to the malicious URL. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/award?keyword=como+aprender+alem%25C3%25A3o+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4529149/normal_5fe6a83d906d0.pdfIn PDF document text
    • https://jevemiparo.weebly.com/uploads/1/3/4/5/134501543/bc99b103ddc98c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393890/normal_5ff0b77bafc09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5fefd2f89fe13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455376/normal_602aeb1a7987a.pdfIn PDF document text
    • https://bifixebuwo.weebly.com/uploads/1/3/0/7/130776276/d31ea90c448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484618/normal_5fe4e6b0d54f3.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/895659.pdfIn PDF document text
    • https://kapuwibipu.weebly.com/uploads/1/3/0/9/130969563/05d0ae9a.pdfIn PDF document text
    • https://rudadikisoma.weebly.com/uploads/1/3/1/6/131606677/xebulod_tajago_dopefis_wagekalip.pdfIn PDF document text
    • https://dozevexenunapaf.weebly.com/uploads/1/3/4/0/134017655/3de7de957997e.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/9706956.pdfIn PDF document text
    • https://bajarewejewud.weebly.com/uploads/1/3/4/6/134673735/kasupesaga_vakusimebiguj_lorafolabe_jefipezu.pdfIn PDF document text
    • https://xobugozo.weebly.com/uploads/1/3/0/7/130739897/wemijakivewewotozuv.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/muvemasoxaji/sanunetumojogedofibawu.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/cassandra_guide_sc6.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/dopolos.pdfIn PDF document text
    • http://penisofitomi.epizy.com/89556031538.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/inflight_catering_management.pdfIn PDF document text
    • http://zepogofeto.epizy.com/bungou_stray_dogs_season_1_batch.pdfIn PDF document text
    • http://xamudakosenezi.rf.gd/lanewuxaba.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_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 5232 bytes
SHA-256: c7e604aa8a5f2891fbc8b3b888b4b037931fdef313a7d87deefb5316093a28af
font_01_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 14032 bytes
SHA-256: 80f1055981314e51f19d4023f106e9ccbaf9ae4ca0c0879bd88fd8cf7f352458

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