Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ddc4289c828fb5…

MALICIOUS

PDF

68.5 KB Created: 2021-02-09 10:27:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ab3833bf266a4a79c7ab9dee988242f9 SHA-1: 7baf230ac57f82dc052c1a62298a6c913927fc12 SHA-256: c8ddc4289c828fb56a2cd55318b4fb8ce7a5016c1b430fe8d3af4799df2508b2
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 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious websites. The ClamAV detection and ML classifier further indicate malicious intent, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs strongly suggest a malicious redirection or download attempt.

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
  • 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://bologen.ru/123?utm_term=apk+dash+tag PDF link annotation
    • https://cdn.sqhk.co/wifopuzuxiba/jakS5hh/94946988512.pdfIn PDF document text
    • http://sosed.market/halo_2_android_apkpit7d.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuxedufexi/ggijaih/vurafevubelikegewa.pdfIn PDF document text
    • http://graatorama.fun/spades_card_game_rules_2_playershz70u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490529/normal_5fcd5fca8aef6.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/jbij1jd/kafijageviwixizutejen.pdfIn PDF document text
    • https://cdn.sqhk.co/belebudetub/jicifgi/15362144309.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/gga5jcb/bekon.pdfIn PDF document text
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/6715607.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/wenobagupexekap/beautician_uniform_custom.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/79952494245.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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 5144 bytes
SHA-256: 624a81c938bb4849ed4b899f1e59489e78d9315f89dc5fb0cca19ca96971cb06
font_01_sfnt_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 11672 bytes
SHA-256: fef1785a4d0c29f02cb46db85e9237f406652c1f7d9f72b8448265d5d19a7911