Malicious PDF — malware analysis report

Static analysis result for SHA-256 917b384365e39f7d…

MALICIOUS

PDF

89.7 KB Created: 2021-05-18 22:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 4b84e6fe1c8ddab9e6c5678f0653d03e SHA-1: 5d33ab20c1d7e53242ef6844268e6dd66b8f7525 SHA-256: 917b384365e39f7df5d53ee2956e21b6120d3831b96bd3d356a16e1ca4957b1f
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 of which are SEO-optimized and point to benign-looking documents, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://jumiwimov.ru/wb?keyword=velocity%20vs%20time%20graph%20of%20a%20ball%20thrown%20straight%20up', is presented as a search result to lure users. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wb?keyword=velocity%20vs%20time%20graph%20of%20a%20ball%20thrown%20straight%20up PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463526/normal_6051ff1a7c3a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fcf750cbcc10.pdfIn PDF document text
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/49891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485935/normal_602e29c3d1079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4526930/normal_5ff7808eeb171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_604634c4794b7.pdfIn PDF document text
    • https://gepogujewo.weebly.com/uploads/1/3/1/3/131382217/6078603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486042/normal_60616fdfe37ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_603f3380520c6.pdfIn PDF document text
    • https://tavutafaj.weebly.com/uploads/1/3/1/4/131482866/7108923.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/wotusilorifijo_tefuku.pdfIn PDF document text
    • https://rapironid.weebly.com/uploads/1/3/1/3/131398378/5686591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450424/normal_60381dcf07c1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5ffd0c7fddbfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458124/normal_600f6534968bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tikofaketonub/how_to_cook_a_perfect_turkey_in_a_roaster.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/transistor_jfet_2n3370_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/7557333498.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/muwevojoji.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/96841801800.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/fb_banner_template_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/bibisud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 5668 bytes
SHA-256: 25101fecd1f2d7f382c628073ddd99daaef333c440cb1e0a412315647c670ea2
font_01_sfnt_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 11264 bytes
SHA-256: 39eaa0c2a08a306643091e96d2eb76362a8533a4a0f771dbe5b08a0143ca4392
font_02_sfnt_off00014aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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