Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91296f750c6b726…

MALICIOUS

PDF

75.6 KB Created: 2021-02-26 07:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ee474e589ddd79cd5b1af679735e2ab7 SHA-1: 5b84b0872315c20131ae8d9e58aa491268cc08f5 SHA-256: a91296f750c6b726fcf9bdb31aea3d92f71025818abf8d8fdfaba404fa3e88cb
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/strik?utm_term=excelsior+springs+missouri+police+department', suggest a phishing or credential harvesting attempt. The presence of numerous links on disposable hosting further supports this assessment, indicating a likely attempt to distribute malware or redirect users to malicious sites.

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
  • 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://yafferge.ru/strik?utm_term=excelsior+springs+missouri+police+department In PDF document text
    • http://harmony-market.ru/69624864627i9028.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/how_strong_is_god_in_one_punch_man.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/63200369832.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5ffe70f6aa22b.pdfIn PDF document text
    • http://xitigedomure.66ghz.com/mizufebowolemuximopuzetes.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/jgzgzji/iihf_hockey_2020_scores.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/43552731036.pdfIn PDF document text
    • http://saudiautoinsurance.com/wiwuranafujujafabukotolx8bus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408333/normal_5ff3727f882e0.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/jjdhiij/bamboo_wood_paper_plates.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/dekoso.pdfIn PDF document text
    • http://nunixofu.22web.org/elise_build_guide_s8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_5fe6209353601.pdfIn PDF document text
    • http://vobasexukux.iblogger.org/gekufokemuluzinu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://notaruk.rf.gd/44797302734.pdfIn PDF document text
    • http://vadinixigejewu.rf.gd/movie_maker_free_video_editor_online.pdfIn PDF document text
    • http://piredesoki.epizy.com/zuzekokexobubabegoxuzomed.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_off0000e902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 5420 bytes
SHA-256: a0c7b77fef2be34701508d6151b9c06ef327ff8b1ec38995759bba53acbd39b5
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 11048 bytes
SHA-256: 165799f041614189510733cac8b767ed65be20153c7f42995f9bee6fb03d4802

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