Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e04539caa260825…

MALICIOUS

PDF

72.0 KB Created: 2021-04-19 09:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9d37a62d803deaa453d496a462c7fd26 SHA-1: b35f900940e0626e44a694b501431c1d808472f2 SHA-256: 8e04539caa2608257703a505c6d846cb712c9261b01460f271f923245a6b2d53
186 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to manipulate search engine results or distribute further malicious content. The embedded URLs and the heuristic firings strongly suggest a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://druttle.ru/strik?utm_term=what+all+things+to+check+when+buying+a+used+car PDF link annotation
    • https://cdn.sqhk.co/tobamozusaj/eBvPZs0/53642848737.pdfIn PDF document text
    • https://lalupapetawosi.weebly.com/uploads/1/3/2/8/132816164/jenidet_rebamet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392861/normal_5fed95d16b142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481403/normal_6041dc0513f06.pdfIn PDF document text
    • https://pixavegabub.weebly.com/uploads/1/3/5/3/135307945/2254768.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/a4jgKJS/guess_the_hollywood_celebrity_and_earnest_money.pdfIn PDF document text
    • http://dasiroxejipi.22web.org/french_food_word_whizzle_search_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/egghfJp/sewafuxufowanorowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_600c15a87cc18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_600795411000e.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/xujuduwisadiku.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/gdxijZN/translate_text_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/ii6IieY/28147854042.pdfIn PDF document text
    • https://pewoguliburutoj.weebly.com/uploads/1/3/4/2/134234653/noloxojezow-sobijazifuxofi-mavugaxu-pawero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_88d2646690e040bfa5e39733b19df3c9.pdf?index=trueIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_6ca5ef85f0c64453bd5cf1764771669e.pdf?index=trueIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_46934776a09c424abcfc2b976f9f7ca5.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_0a5b93ac27bb46c991e21c4ba4dd713e.pdf?index=trueIn PDF document text
    • http://kugefosames.rf.gd/indesign_newsletter_templates.pdfIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_70d829f51dc14af9bac64aa21550a6d5.pdf?index=trueIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_f3da616c34284db9a4df07ff36323c6e.pdf?index=trueIn 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_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 5612 bytes
SHA-256: 423ec3393e73b20db91394258c04da8f845b341f29314ccc64abcb867c7ac5f4
font_01_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 10292 bytes
SHA-256: ff16807282ba8c295000ed682f71956bd0b4ee462c214d8c42f477602f78f1c6