Malicious PDF — malware analysis report

Static analysis result for SHA-256 457cea0eb579133f…

MALICIOUS

PDF

109.4 KB Created: 2021-02-19 09:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ede5f751a1359401a963874b5e524035 SHA-1: d9dee3e83e8940351b414eb02b035bf430bd9d38 SHA-256: 457cea0eb579133f4362251517d114c45e4e62b61f21978bc1c37ad2fb59f933
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards an attempt to redirect users to harmful content.

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://crophysi.ru/strik?utm_term=lakota+woman+chapter+5+summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_5fd785aea9dd1.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/cjJgflp/fovekotosenukinufasobi.pdfIn PDF document text
    • http://tawiwadebez.iblogger.org/toksisitas_amfetamin.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/ijNGLbX/minecraft_pocket_edition_gamertag.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://wiximevisek.epizy.com/90060953694.pdfIn PDF document text
    • http://rumawotipu.epizy.com/why_does_battle._net_so_slow.pdfIn PDF document text
    • http://vobununebufipu.rf.gd/gusion_mlbb_guide.pdfIn PDF document text
    • http://gaxojasajanori.rf.gd/naviculocuneiform_joint_arthrodesis_cpt_code.pdfIn PDF document text
    • http://vetisuduxujin.epizy.com/mibumewugefu.pdfIn PDF document text
    • http://rorufefujolag.rf.gd/crisc_study_material_free.pdfIn PDF document text
    • http://damewanobojojo.rf.gd/dagiluligomumekeseduja.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_off00016157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16157 5296 bytes
SHA-256: c8d5a2ec4d061dbecf028111d2bd7ab36043fa6818e650cd73206caa6def219d
font_01_sfnt_off00017342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17342 11340 bytes
SHA-256: 0a3e62d10319a0dbc7c9e6f63684c8f310bdf52fce686a50fc664b30b4c4fb99
font_02_sfnt_off000198e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198E0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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