Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe440fbe0dacf033…

MALICIOUS

PDF

83.2 KB Created: 2021-01-20 02:06:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b0843a31f3e652233c948403f29144d7 SHA-1: abf996b87483f5d568fa7c6d6620a317631a16af SHA-256: fe440fbe0dacf03355cf2b6f5a90f4858d46ef5e75f7afac7db3d087752ab712
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of malicious links suggests an intent to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=alex+rider+scorpia+rising+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fc9d4dda7ded.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386834/normal_5ffb6e3e94349.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/5198585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5f87ecdc2ccdf.pdfIn PDF document text
    • https://site-1248608.mozfiles.com/files/1248608/a_practical_english_grammar_exercises_1_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_5f8bc990e698f.pdfIn PDF document text
    • http://lirelejavebot.iblogger.org/amistad_academy_uniform.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f8e387ed2984.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
    • https://s3.amazonaws.com/zepifudoxapo/keyset_does_not_exist_reporting_services.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/wurotufalirejaduz.pdfIn PDF document text
    • http://lowadof.epizy.com/pumosovigodemu.pdfIn PDF document text
    • http://niworojuxine.rf.gd/teninumuragesikavubefup.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/cool_cv_templates_doc.pdfIn PDF document text
    • http://fuvituze.epizy.com/anticlastic_forming_disks.pdfIn PDF document text
    • http://mibofive.epizy.com/zujolefixop.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_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 5088 bytes
SHA-256: 5e79c7bb5dac83f0e2f4d5bad551caefbe02c40b9e0fa6ac3d5ee7da8fb1acec
font_01_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 10764 bytes
SHA-256: 67569d82887e19d9a9d55765d3dba39113d763eb92335d0430bae7a7e185694b
font_02_sfnt_off000131c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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