Malicious PDF — malware analysis report

Static analysis result for SHA-256 218cb051116b3cc8…

MALICIOUS

PDF

94.5 KB Created: 2021-03-03 12:29:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a741dcb6183854cde0a7b77313b9645c SHA-1: f092fb97556c53f2b69540bb02af24f212e4c76b SHA-256: 218cb051116b3cc8e8cac793349b4d71092f0f5468e3a2be081f425ffa539974
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing for credentials or delivering a secondary payload. No scripts were extracted, but the presence of many external links points to a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=food+safety+inspector+jobs+melbourne PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fe83aae20db3.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/hbzDhe2/98517440330.pdfIn PDF document text
    • https://cdn.sqhk.co/mitajaso/PgiibtY/79614009233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_60092c8589324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459939/normal_5ffdd1f568d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_5fdac6e623ef8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471710/normal_6002e0e90670d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473056/normal_5fda1588cfdca.pdfIn PDF document text
    • http://aydym.club/xapofubupowafasevazade2p0e7.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/f6giGjf/60623180468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5ff15744b5ec7.pdfIn PDF document text
    • http://salearea.pro/18140196265vvxls.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_60298b0570b08.pdfIn PDF document text
    • http://fumigatoff.online/basics_of_digital_communicationt0io2.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://sofidusujewa.epizy.com/16812285089.pdfIn PDF document text
    • http://vuzudaru.epizy.com/mibekamojoretero.pdfIn PDF document text
    • http://vuxubeso.rf.gd/25207086408.pdfIn PDF document text
    • http://xukiwelufa.epizy.com/boy_scout_child_protection_pamphlet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 5456 bytes
SHA-256: 3865e9789fdad1c10a68d1fc4aa6c1b158c39797d8f88e7d61596f337b05fb7d
font_01_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 15844 bytes
SHA-256: 472642f000fa81031c3ede7eec99867d3b4d0e4b43b9e32b5a985050edadec25
font_02_sfnt_off000148e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E1 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_03_sfnt_off00015e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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