Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4bbc36b3f3f947…

MALICIOUS

PDF

91.4 KB Created: 2021-02-23 02:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 87979a6430d062c6170c8f340ad11320 SHA-1: ddbced3cf23edbf66978227c0291b34ceb838c18 SHA-256: fd4bbc36b3f3f94762eddb20ae43a95d881caa13bae924c326fa4d60a663969a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating it functions as a malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be directing users to potentially harmful external sites, as evidenced by the high number of links and the specific detection of a phishing trojan.

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=tower+of+nero+summary In PDF document text
    • https://dimawirosaj.weebly.com/uploads/1/3/3/9/133997296/kapewonifi-wosotesefan-wikatomanuk-tulumopixuwifex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_60342cad864f2.pdfIn PDF document text
    • https://tutamedu.weebly.com/uploads/1/3/1/8/131856186/7fd84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fccc2ca9ec4b.pdfIn PDF document text
    • https://bagamijak.weebly.com/uploads/1/3/1/3/131380043/pugitogine.pdfIn PDF document text
    • http://tehnotop.space/21114139458fjocu.pdfIn PDF document text
    • http://onlinekartiadesi.com/83476840919qtegb.pdfIn PDF document text
    • http://motivawka.online/juxesonodufozimulotiramsrqn.pdfIn PDF document text
    • http://filemarker.store/giuseppe_ungaretti_mattinamdbug.pdfIn PDF document text
    • http://static-get.top/70063347504qgsyf.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/pasutiz/bowflex_xtreme_home_gym_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/ave_sin_nido_clorinda_matto_de_turner.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/bomberman_unlimited_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/basic_english_grammar_by_indian_author.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_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 4780 bytes
SHA-256: 021f7255bb82d2357d01e45586778b2c305c3ad616da9900788eb04bf9fc0c82
font_01_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 10808 bytes
SHA-256: a5904699400b71eea5c6a78fa2e035791f26602494b0934ff18fffd0f84a0d82
font_02_sfnt_off00015282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15282 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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