Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7d0ffbebcfebcb…

MALICIOUS

PDF

78.2 KB Created: 2021-03-02 07:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 15140b54dd22fcfcfe7a1b82d54aa180 SHA-1: 10c73f6eb414a13bc5a69866c89233b0e8ba39f8 SHA-256: 1a7d0ffbebcfebcba700f3ed680992e80ef4874e15f24ce7c7d5706ac578b909
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on link-farming domains, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate this is a phishing or trojan distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=similar+polygons+worksheet+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/wujakegu/zidzigK/ramukomulufigiberi.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/jeTtghH/hair_clipper_2020_haircut_pranks.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/gejiz-motibapoxoganar-welizinumoxe.pdfIn PDF document text
    • https://sikezenubotimer.weebly.com/uploads/1/3/0/7/130739875/53cc0274000cc6.pdfIn PDF document text
    • https://xewurilarigifu.weebly.com/uploads/1/3/4/2/134236076/9807991.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/vasipip_gusifunudali_duzosevajakab_saziveperegif.pdfIn PDF document text
    • https://cdn.sqhk.co/tinukomafiro/hjjeGgi/91846303003.pdfIn PDF document text
    • https://kevelowomovozi.weebly.com/uploads/1/3/4/0/134012304/7486499.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/ajbehgh/34110366937.pdfIn PDF document text
    • https://cdn.sqhk.co/tobizopowebo/ZAVgbif/silicon_valley_humane_society_donations.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/fhcVggi/71137845732.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/ehhfTjf/93067760503.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/tumuzu/85976705085.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/coursera_machine_learning_andrew_ng.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/didomazexekosovavilu.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/6766163142.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 5816 bytes
SHA-256: 30ef76f38bb1def6d41101d3f3d46da40aee48568862907d49bfdd1f855dfc3d
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10684 bytes
SHA-256: 98d4c708f92b606cd534cbc9acb7e804012d8253e8e5f9b2e362d1038cb52443
font_02_sfnt_off00011596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11596 16356 bytes
SHA-256: ba990c4d3ff27d9245790c165b6b85873b6c9bf95e52996b1bf9041fe07eefb9

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