Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada52039d7b6c1e6…

MALICIOUS

PDF

79.8 KB Created: 2021-02-23 08:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 841e0f29a3df89b3f67a2793f0c45708 SHA-1: c3581dd690c5f5b28156bd8d04d593ebf1aaed2d SHA-256: ada52039d7b6c1e65c269624ca6449fa23324a6691b847c7ab075514fce0d220
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to various domains, many of which are hosted on disposable or link farm services. This strongly suggests a phishing or malware distribution attempt, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan'. The ML classifier also flagged this PDF with a very high probability of being malicious.

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
  • 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://jottigo.ru/wix?keyword=tire+barn+terre+haute+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490116/normal_6023f15b9bf7f.pdfIn PDF document text
    • https://tadirexexex.weebly.com/uploads/1/3/2/6/132695418/wuvalexifim_durug_pifudaje_pamapadare.pdfIn PDF document text
    • https://cdn.sqhk.co/nalogigoke/qGhhjiy/pomejeselibiper.pdfIn PDF document text
    • https://savaxibinis.weebly.com/uploads/1/3/3/9/133997587/dcb250003.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/35d8c5cd8.pdfIn PDF document text
    • http://zisesiso.22web.org/effective_communication_skills_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484623/normal_5fcaf873a7d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_602011b716dae.pdfIn PDF document text
    • http://zumofujej.iblogger.org/galvanized_sheet_metal_rolls_for_sale.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/6397955.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/W5HhUxF/cross_over_the_bridge_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_603482de37a54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530171/normal_6006969eca345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_602eb630000d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wakinenuzubuvu.epizy.com/what_animals_are_in_a_pond_ecosystem.pdfIn PDF document text
    • http://sasezer.rf.gd/nijejer.pdfIn PDF document text
    • http://zagebixomibolo.rf.gd/jugivixabaza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 4752 bytes
SHA-256: 2db4596c30c59090095f683ad319be969e947b8532c45063563f9c4729b43e4b
font_01_sfnt_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 10368 bytes
SHA-256: e767e947c797cd29105eb801d29d0ef76fc2854d4701ff6c403a43c443816bd7
font_02_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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