Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f5883efaaabff3…

MALICIOUS

PDF

89.1 KB Created: 2021-02-15 13:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f9b2d2666db35e90648c0083d5648433 SHA-1: bb437a2026bbe53ba19c039028ee9117ede63fac SHA-256: 61f5883efaaabff3cd3b6c1b05ef6796b8be48aa703d6f8b4c0f89f2a185ec4f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirectors, indicating a link farm designed to distribute malicious content or phish users. The presence of a link to a known malicious redirector and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=why+won%2527t+my+toro+push+lawn+mower+start In PDF document text
    • https://cdn.sqhk.co/dabigewom/Uhgihic/high_school_escape_2_level_9_code.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/bwjcig4/zowipiwalamaxazivodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_5fd65c058750d.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/wEcihhb/primark_neon_snake_print_dress.pdfIn PDF document text
    • http://xatamekele.iblogger.org/anaconda_1_movie_tamil.pdfIn PDF document text
    • https://kifoguwo.weebly.com/uploads/1/3/1/3/131383532/209587220.pdfIn PDF document text
    • https://cdn.sqhk.co/jidevumedure/hahbXjj/65217062361.pdfIn PDF document text
    • https://cdn.sqhk.co/latosagax/jfjiiez/best_emergency_alarm_for_elderly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420612/normal_6000fbedd917b.pdfIn PDF document text
    • https://bafibosu.weebly.com/uploads/1/3/0/7/130738803/fegen.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/lafav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377936/normal_5ffcfe1bb268d.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/lusegokaves/tosalemotixi.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/team_beachbody_coach_switch_form.pdfIn PDF document text
    • http://zawozunilutufu.rf.gd/tenokupapapok.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/ipad_airplay_android_box.pdfIn PDF document text
    • http://lekozuni.epizy.com/four_hour_body_fat_loss_cheat_sheet.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_off0001151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 2940 bytes
SHA-256: 5205dc029b2d4b0ae44ddd8c96d056e1801b9f6b3c115db4e44038fa36e83b83
font_01_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 5300 bytes
SHA-256: 7a78b03f35d43d21926092d5a8a6aab25b4f3ba10798d3c62adc8601f0c11dbf
font_02_sfnt_off000131a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A4 10924 bytes
SHA-256: 1c977b8e64c00359415e919dffd882e6ce6ec2e33ad12e3f261a40bd1d659d3c

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