Malicious PDF — malware analysis report

Static analysis result for SHA-256 72418ad0448e3182…

MALICIOUS

PDF

81.3 KB Created: 2021-02-23 06:31:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 616a53854c2cfcb9c71148079701cb83 SHA-1: 2264068573089c42d8aad5dcb33fb9636406602d SHA-256: 72418ad0448e3182ae3f8465b77cc83e329b5e42e41e2bd4147ad78f2950c479
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to a phishing page or a second-stage download.

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://seumenha.ru/strik?utm_term=why+was+dark+angel+cancelled PDF link annotation
    • https://cdn.sqhk.co/xemugugafot/dsHgcja/cat_opening_mouth_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/nhchggf/chicken_sounds_like_dinosaur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_601cf838b262f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_60267f97df660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_5fd2e77154aa7.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/j7iXHzx/cramped_chapatis_meaning_in_bengali.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/jjoljbF/roxikojomegaloboferegavab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fc729dc1fdb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_600f8737d879e.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/zhclbig/battle_pass_assistant_season_9.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/jiwisi/would_fill_a_void_meaning.pdfIn PDF document text
    • http://zivufev.rf.gd/happy_farmer_piano_sheet.pdfIn PDF document text
    • http://sazevaxorofezag.epizy.com/konetef.pdfIn PDF document text
    • http://linakagiwabofa.epizy.com/95968411639.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/performance_appraisal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/ieee_standard_srs_template_example.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/74288057163.pdfIn PDF document text
    • http://zujozovasa.rf.gd/hour_of_code_certificate_template.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 5472 bytes
SHA-256: 9667c6448b19b0e61c1c6cf120c2d59a17f8eb07795b55c452eaef6d281eefcb
font_01_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 9960 bytes
SHA-256: 95ee36c917d715e23b2b875d4a957c66e9970cb2458160b7aa5422ef2743d7a0

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