Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57b92d625274d75…

MALICIOUS

PDF

73.7 KB Created: 2021-02-21 19:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4ebe5b2885ae6b72e2304996c4d5eca0 SHA-1: 98f7fc9a7e2a057c152ebc460de6bc56e7701ffd SHA-256: a57b92d625274d75eba9a4f629e810dd1b05abe36d9bd786c1404b4754f296af
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. The embedded links, such as 'https://crophysi.ru/strik?utm_term=how+many+carbs+are+in+a+chicken+taco+salad', point to known malicious redirector infrastructure and disposable hosting, suggesting an attempt to trick users into visiting harmful sites. The document's structure and numerous links are consistent with a link farm attack pattern designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=how+many+carbs+are+in+a+chicken+taco+salad In PDF document text
    • https://cdn.sqhk.co/simizekovogi/8DTjgii/76877662554.pdfIn PDF document text
    • http://uscarinsurance.info/counter_strike_free_pc_windows_7eietz.pdfIn PDF document text
    • http://poradoit1.site/p90x_nutrition_planha1zz.pdfIn PDF document text
    • http://trixy-matrix.space/stock_market_closed_on_thanksgivingi8kjm.pdfIn PDF document text
    • http://trendmobile.ru/brave_frontier_2_trial_4_guidee2r40.pdfIn PDF document text
    • http://natlab.ru/windows_7_home_premium_oa_download_isow5dl1.pdfIn PDF document text
    • http://beremoter.online/35400627389vk9r5.pdfIn PDF document text
    • http://agencymedia-ig.com/oxford_reading_tree_stage_549e22.pdfIn PDF document text
    • https://cdn.sqhk.co/lutidofele/giOyhdC/sibivubopojogerufajov.pdfIn PDF document text
    • http://makeyourself.xyz/hrm_internship_interview_questions_and_answers44hxi.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/NjafAja/game_talking_tom_jetski_2_mod_apk.pdfIn PDF document text
    • http://biggymstoe.com/antony_beevor_the_fall_of_berlin_1945pweg7.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/DidjfFg/vaxomedovusudu.pdfIn PDF document text
    • http://ig-socialmedia.xyz/arc_mate_100id_datasheetufl0d.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/xoguwavosuje/79171107841.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/free_company_business_card_psd_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/kafovilepafevofije.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_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 5540 bytes
SHA-256: 7c5a8e6afad90be80f61fb8e24e3884c66ef4bb18fb7c0cebb4432e4834dc7d1
font_01_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 10744 bytes
SHA-256: b6f03021fc6ef0ba8f8aabf92ecb0f6e77c93c47597af5cbb1e76685458f7c81

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