Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c35993fdb0836af…

MALICIOUS

PDF

96.8 KB Created: 2021-02-11 11:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0a6efd8162fe7d7eb210f5e3996900ca SHA-1: c83b2a7cd38db9cca39bcf29b763704c9f44aa14 SHA-256: 7c35993fdb0836af88e012e2993676051358c37354dc3531f17dbed879ba7422
184 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing or trojan. It contains a high number of embedded URLs pointing to suspicious and disposable domains, indicating a phishing or redirection attempt. The presence of a link to known malicious redirector infrastructure further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/123?utm_term=thank+you+german+pronunciation In PDF document text
    • https://cdn.sqhk.co/luginuwi/jgvhfie/12193631692.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5fee17aad593a.pdfIn PDF document text
    • https://cdn.sqhk.co/jinokazif/cgihiVT/ultimate_car_driving_simulator_hacked_version_free_download.pdfIn PDF document text
    • http://mail-autoscout24.net/792917872384ggwl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fe196b221492.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/sizelewomisidup_kavuwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471985/normal_5fc6bdc689441.pdfIn PDF document text
    • https://cdn.sqhk.co/notokulojow/dWheRjc/color_fill_gun.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/Thd6Ajg/fun_facts_about_halloween_1978.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/2X0ggIt/nostalgia_electrics_6-_can_mini-_fridge_black.pdfIn PDF document text
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/kukalop.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/csg89Tj/nuworelajukuxefapapan.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/gehfjiO/fine_dining_near_me_open_late.pdfIn PDF document text
    • https://xanikijopido.weebly.com/uploads/1/3/4/7/134738407/raxezuxivejalut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463009/normal_5fdbbb3b60aad.pdfIn PDF document text
    • https://varupeneg.weebly.com/uploads/1/3/0/9/130969993/649a6f83c360d.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/lovomijelun/animal_crossing_pocket_camp_character_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/12915504067.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/52541697685.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 12820 bytes
SHA-256: ad8c264fe3ff8afdfc686f90878630c0413d39242bb0d2178553e730c37d5cbb
font_01_sfnt_off00012b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B83 5252 bytes
SHA-256: 73e8fa04ff0574ed024a79bdbe6963cc8838545a11e0dc82978174c2f1cb33c5
font_02_sfnt_off00013d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D45 10320 bytes
SHA-256: a06971d3aa84507997fc1d1c150bd88c1bd6fc301368dae385908565228aac59
font_03_sfnt_off0001609a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1609A 16128 bytes
SHA-256: 9876d0897ec9c8daf800546b62de215c972fdd6e45e85ac3a8ec620a70dbc6f8