Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc8f5ea9376f1bc…

MALICIOUS

PDF

85.7 KB Created: 2021-04-06 09:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1ecc889694a08705f39386dd2c99a099 SHA-1: 27ec33ade24b8cb1fe8e7cf024fb66832ed73af4 SHA-256: 3fc8f5ea9376f1bc20b0e4af534b1fa31e4284ea6a48dfc658d41c5201198e70
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains and forming a link farm, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://zajinet.ru/strik?utm_term=topdog+underdog+gestalttherapie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466364/normal_5fe0a82d749f8.pdfIn PDF document text
    • https://zanikegira.weebly.com/uploads/1/3/1/4/131437850/a4bf7809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_6043ddd523a1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_600ca2b9cce28.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxogatuv/bOAiajf/battery_charger_schumacher_walmart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401716/normal_60698c688c2f3.pdfIn PDF document text
    • http://istlan.space/dapebinexumifnq20.pdfIn PDF document text
    • http://slmit.fun/cucet_previous_year_question_papers3fbt.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jjdNDhe/37593679956.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/ngdij1N/summoners_war_mysterious_plant_worth_it.pdfIn PDF document text
    • https://cdn.sqhk.co/nunexijezep/ihjijfy/8521829143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381528/normal_5fcdc12d51106.pdfIn PDF document text
    • http://gradstroy.su/189993556172vy7w.pdfIn PDF document text
    • http://demask.space/81550869063p4oil.pdfIn PDF document text
    • http://cyberlife.store/coding_all_in_one_for_dummies_reviewziac0.pdfIn PDF document text
    • https://cdn.sqhk.co/jigijobofofa/fKij2az/bluff_my_call_download.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/02feb2ccb2c27b2.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/zolerazowubow/brother_7860dw_scanner_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/where_is_covid_19_testing_in_my_area.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/call_of_the_wild_chapter_7_summary.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_b12c97df74524888bab3e29ff7eaacb0.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_4f6dbf809eac420d9795405b1724508e.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_off00010f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8A 5172 bytes
SHA-256: a7b61ff5e4041d8471fd7548d298b758ff1dbf9c80ff9906c585cfd6973dfe36
font_01_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 12300 bytes
SHA-256: 87d20b4d59fb373cebbb96954162366825899af580aa10d4678df91b755e3e81

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