Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1df70d8d532c391…

MALICIOUS

PDF

61.4 KB Created: 2020-12-22 05:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 84c6fc87cab0b8f2a099929b42852943 SHA-1: d9735494eb6cc3e572ce2f6d31ddae7896bfcc47 SHA-256: d1df70d8d532c39177f014d8ade153a6d94ee9fd1cd12b173d1bb82b2d48a2ac
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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.
  • 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://ggtraff.ru/wb?keyword=smashing%20pumpkins%201979%20bass%20tab In PDF document text
    • https://dobekaveliwe.weebly.com/uploads/1/3/4/5/134599348/4720328.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/37c83d.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/d0ab7c502b6.pdfIn PDF document text
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/dujoferixosuv-fidujagunenub.pdfIn PDF document text
    • https://figotuzu.weebly.com/uploads/1/3/4/5/134579221/5852485.pdfIn PDF document text
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/1595074.pdfIn PDF document text
    • https://minizaderi.weebly.com/uploads/1/3/4/3/134344024/e0fd92df34.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/makumapikeze/chief_information_officer_definition_business.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/free_basic_english_lessons.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/distributive_property_worksheet_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/pimebutabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4404e04-5a21-42d7-8a4a-c203a01d93b5/funedodavelomo.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/hose_for_subaru_ea190v_power_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95863867-43e6-4f32-bccc-b8792b82a5d3/letidisusut.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_off0000b2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DC 5700 bytes
SHA-256: b70d8c2f131c55a41d56a22c28d92c0f9747f3958fd40a5e0d511120953f44e8
font_01_sfnt_off0000c621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC621 10328 bytes
SHA-256: 1384881272d9a56deadf235a7bb37ef626708fcfa0006355c9987742a85473a2

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