Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02591b5d701bdc8…

MALICIOUS

PDF

87.5 KB Created: 2021-02-20 00:25:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: cf1c793e1f068c1d50931916622a3cf9 SHA-1: 2e25f05f27782a8af6267b3206af60c1883b0250 SHA-256: d02591b5d701bdc84ff0ad0dcba7073ed51c6acf7993a9efdb7a938e607efdf3
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URLs, such as 'https://crophysi.ru/strik?utm_term=radical+honesty+brad+blanton+deutsch', are indicative of phishing or malware distribution attempts. The ML classifier and ClamAV also strongly suggest malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=radical+honesty+brad+blanton+deutsch In PDF document text
    • http://relax35.ru/pewasaxipurfany.pdfIn PDF document text
    • http://xruhdfo.site/6990309759881yg4.pdfIn PDF document text
    • http://ellmax-site.xyz/liwisifaboserojafiguivjhe.pdfIn PDF document text
    • http://begemotiks.fun/bootstrap_4_form_submit_buttond1bpv.pdfIn PDF document text
    • http://crysety.xyz/kupabuwoijw.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/fgcgeij/45406919404.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/hiZ0Ugj/lujasodizagefubuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_6019805d77a82.pdfIn PDF document text
    • http://kataeta.club/clash_of_clans_war_base_layout_tipsfm04v.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/xghjjdR/scruffy_dogs_for_adoption.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/dWgjib1/nhl_hockey_jerseys_near_me.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/ledem_mifoxesepelofe_jepoguvuwur.pdfIn PDF document text
    • http://bestplacefor.rest/77050737017mwou.pdfIn PDF document text
    • https://cdn.sqhk.co/japuwejede/cEcgdtR/bridge_constructor_game_free_download.pdfIn PDF document text
    • https://fidedelab.weebly.com/uploads/1/3/4/0/134096197/c074063a.pdfIn PDF document text
    • http://antonioit.fun/cyperus_odoratus2d0oj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazafowunop.epizy.com/911_driving_school_test_2_answers.pdfIn PDF document text
    • http://xalovizavana.rf.gd/75169672953.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_off00011477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11477 5276 bytes
SHA-256: 901d57878e6907c4b820449a1de5e108f37e12500e4c2cbda3ffed8d024c880c
font_01_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 12416 bytes
SHA-256: a4163d38b42e0a9cc776052073a04a7d60b3d69df962488905d7e5da84202105

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