Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bdc0236f02e265…

MALICIOUS

PDF

95.0 KB Created: 2021-04-14 09:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 39577b6b4acf91a1692a665c9ae12a52 SHA-1: 866c94787f8ae9bdb5340cffd30dc1c18f6de822 SHA-256: 42bdc0236f02e265095e080effb33b8a50c93546bb5a5cbd02e71bd36948197d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with several pointing to unknown or potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to harmful content.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=what+caused+the+first+agricultural+revolution PDF link annotation
    • http://redpandarecycling.com/bewavixewisaxodamopumajputvw.pdfIn PDF document text
    • http://bcipreactivaperu.com/programmable_logic_control_courseshtvoe.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/47609124244.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/sujekigesu.pdfIn PDF document text
    • http://testertumentum.space/826824075671pnz9.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/gifikuxenijote.pdfIn PDF document text
    • http://clientbluebadge.com/sony_str-de845_protector_modeamolq.pdfIn PDF document text
    • http://sovetnik53.ru/apollo_munich_policy_number_formatz2h76.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/3jEjahi/36283472239.pdfIn PDF document text
    • https://vepezoroz.weebly.com/uploads/1/3/4/6/134605761/8310437.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufojigox/ghbfrOO/jutizewux.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/list_of_german_adjectives_a_z.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/dozore/science_of_logic_di_giovanni.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/easter_bonnet_hat_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/4227275777.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/jifilodubojifananusu.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/examples_of_text_structure_paragraphs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 5356 bytes
SHA-256: c704e47acd94078cf375a22864046b8ca0fc668f57d72041c7dd47c54dda3cb2
font_01_sfnt_off0001475c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475C 12652 bytes
SHA-256: adee25fe410f3190d0b41e957eff32580428aece8aa74df8942295959451827d

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