Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d092c41e5af024…

MALICIOUS

PDF

58.5 KB Created: 2020-12-24 06:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 90433d6ea3df3428bbcd269b6a6f4285 SHA-1: e1978d7c66494329605b042930531c3dbd226745 SHA-256: 56d092c41e5af024f24cac403a29f5cc9445df62d6a25dfcd07abb3e95d9eade
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, potentially using a spearphishing attachment vector.

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
  • 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://trafffe.ru/aws?utm_term=hoopsters+crossword+answer PDF link annotation
    • https://zufuxanibagi.weebly.com/uploads/1/3/4/5/134586570/gerumodugimipotik.pdfIn PDF document text
    • https://cdn.sqhk.co/bifugudawesu/ZibBWTr/apple_store_black_friday_deals_online.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/hdjfeKJ/puniziraxuvimuvupo.pdfIn PDF document text
    • https://vumuzuvi.weebly.com/uploads/1/3/4/5/134506571/6064174.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/SOLQVhc/to_the_moon_phora.pdfIn PDF document text
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/luvulaxuwud.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/sobakanefumexivafela.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/voropa/71910860878.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/accident_and_emergency.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd808d4-222b-46a2-afb4-6541525c31d7/mubilafetirubokif.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/after_effects_free_projects.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/child_drawing_book_free.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_off0000aaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAACA 5088 bytes
SHA-256: 2900e84eac06aa821e96aae244262b98be52979655aea1915fdadbf2e35713c8
font_01_sfnt_off0000bc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC34 9668 bytes
SHA-256: 0682ac20c611f50174fa4063baf1efc44cd3ef9b72a933c8d0263fee10d5da81

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