Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf3e77f8f3a465d…

MALICIOUS

PDF

69.6 KB Created: 2021-05-17 16:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6d87a2a2d99a6877889395adbac0bdd7 SHA-1: 2f7e65c546b5fe57764a46886fe2626cb1f39d11 SHA-256: 9bf3e77f8f3a465ddffda6b86235105afd1128bc967cc419f2633f33aa16f188
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and disposable hosting. The primary malicious link identified is https://dafemum.ru/strik?utm_term=matlab+solutions+chapter+1, which is flagged as a known malicious redirector. The document's structure and link farm indicate an attempt to direct users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://dafemum.ru/strik?utm_term=matlab+solutions+chapter+1 In PDF document text
    • https://cdn.sqhk.co/matajikiwov/a8tbDjf/dazagomuxozafofurewas.pdfIn PDF document text
    • http://lefijuf.iblogger.org/zofolusevubenurekiziz.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/ibhbAhj/talking_parrot_bird_toy.pdfIn PDF document text
    • http://kipupera.22web.org/65544486489.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/ajedPwq/thanks_giving_color_by_number_glitter_paint_booklet.pdfIn PDF document text
    • https://cdn.sqhk.co/lifupowaseli/Isjgchh/41949446576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_c009f49f32fb4847aa7f89502503f00f.pdf?index=trueIn PDF document text
    • https://a72a04b1-e5b5-4d9d-bdd8-34e053c51a64.filesusr.com/ugd/9c50a8_2d9eebad9d6b4507bf5053dae93cae93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7300f5e0-3e34-430d-8ad0-7b0426f842cf/docker_commands_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a75ce2-0665-4362-91a1-5ac6186f49f5/68831389857.pdfIn PDF document text
    • http://levurugagizov.rf.gd/kizebuxip.pdfIn PDF document text
    • http://namofigironebej.epizy.com/ashab_e_kahf_story_in_urdu_free_download.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_56c6883b22cd462db0f2459389c75cc8.pdf?index=trueIn PDF document text
    • http://tokivatifizaxe.rf.gd/kumara_satakam_in_telugu.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_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 5216 bytes
SHA-256: 42aa980804963fdae7b147b69caa0779b540cf4f04cf0c2e65c3c828ad18a808
font_01_sfnt_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 10544 bytes
SHA-256: eb120b311b863cfd641c6d1cec1260509c6c628796345e219154f712d70a75e3

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