Malicious PDF — malware analysis report

Static analysis result for SHA-256 06137955af8d7695…

MALICIOUS

PDF

88.9 KB Created: 2021-02-21 03:28:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3d26dd787a05627d154c836b5368892e SHA-1: 2bb2785395335aa25d7810aa91b6a167ee45040b SHA-256: 06137955af8d769520c3db237baabef3fd96459ea64bda40765bec75ec11ed3a
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 pointing to external PDF files, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=alesis+dm10+mkii+pro+vs+strike+pro In PDF document text
    • https://cdn.sqhk.co/jarixizotib/jf2hcPB/best_likes_video_cropper_mod_apk.pdfIn PDF document text
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/9915bd659a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425507/normal_5ff9158ef0b37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374364/normal_5ff81d5bdf541.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/agdhfTn/rijorenutovamojajosadoler.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500883/normal_5feed6e3aa8f8.pdfIn PDF document text
    • https://cdn.sqhk.co/zanaforare/hhhcTky/95347144724.pdfIn PDF document text
    • http://tixshopclub.fun/99967299659kmots.pdfIn PDF document text
    • http://rating-bookmaker.ru/kekum3nbmo.pdfIn PDF document text
    • http://hangookoil.ru/alcatel_one_touch_pixi_7_resetmcq77.pdfIn PDF document text
    • http://itnegozio.info/avital_one_button_remote_start_programmingbqa11.pdfIn PDF document text
    • http://starkrobotics.org/medical_billing_and_coding_for_dummiesclm5y.pdfIn PDF document text
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/xosovotigapelevafore.pdfIn PDF document text
    • https://fuviwamirami.weebly.com/uploads/1/3/5/3/135351498/pebub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452845/normal_5fea0d51daff0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427093/normal_5fef478746e3e.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/kjcjgji/best_light_up_christmas_jumpers_2019.pdfIn PDF document text
    • https://biputivaninude.weebly.com/uploads/1/3/1/4/131438500/rasukaxiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/dp9hjjc/stress_ball_price_in_nepal.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/ruzumeb/magento_2_get_email_template_id.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_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 5204 bytes
SHA-256: a8967c106cbf6692853d88d9e8bcb610ce1b3de3b78386bd320e9a362986cb90
font_01_sfnt_off00013028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13028 11132 bytes
SHA-256: 16a0cdf1b419ec8ff2611019a8af5e34ab4d0a94a804f7523d49289eb5ad9f45

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