Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c76d065f74778a…

MALICIOUS

PDF

77.3 KB Created: 2021-02-23 10:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a415b8463cea6c3d3fe7ec7896db4931 SHA-1: a75b06c3f9c47c3bb6ebd63166e207ec0e33b908 SHA-256: c2c76d065f74778a97cbf7157b94f23ed2ba15039aa8b65ec1eb77664c284ef4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and embedded URLs suggest the document's primary purpose is to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://yafferge.ru/wix?keyword=city+folk+hair+guide In PDF document text
    • http://groshyk.site/gerund_worksheet_high_school7sih5.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/6496548.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/e8idjhe/download_game_head_ball_2_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/josozudibud/jdhdzgc/face_mask_necklace_holder_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5ff3094c9fb71.pdfIn PDF document text
    • https://raxuremaxu.weebly.com/uploads/1/3/5/3/135350699/8303967.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/hifjeBD/kodiak_waffles_review.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/1620b648a.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/dhijlhf/ticket_to_ride_europe_board_game_geek.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/jgjimDK/wrestling_revolution_mod_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/BjgIHjj/pafasewakuvetaxe.pdfIn PDF document text
    • https://pizanege.weebly.com/uploads/1/3/5/3/135391653/togomosuxos-rakavololujut.pdfIn PDF document text
    • http://ylyn.ru/ielts_speaking_makkar_may_to_august_2019hya1v.pdfIn PDF document text
    • https://cdn.sqhk.co/lomotutuwe/jfhggje/maverick_electronic_food_probe_thermometer.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/nelizenejakarug/20147030099.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/92810639073.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_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 5064 bytes
SHA-256: 1ada5b52328b7e58bac67fb8b6d77c809ddb26ff538a2db6b4cb310ac8020d01
font_01_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 10324 bytes
SHA-256: e5f4393f3822f8d9089f7b55ff982e3537994db534e78c3b70dd3bdd2c096351

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