Malicious PDF — malware analysis report

Static analysis result for SHA-256 40474d3bb74d4e67…

MALICIOUS

PDF

75.0 KB Created: 2021-03-23 17:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8b0f74885d89254dafa5720813f24460 SHA-1: 2238b3158b7c90029b4d8f3804604aa6a129b034 SHA-256: 40474d3bb74d4e6713a8eae2ddb7553dc8872e27d62c0af4e8192eee07368ad3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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/123?utm_term=mpn+coliform+bam PDF link annotation
    • http://wepipedudi.22web.org/fovapad.pdfIn PDF document text
    • http://mexicotop.xyz/free_natal_chart_compatibility_with_birth_timesuo4hq.pdfIn PDF document text
    • http://jopkapopka.online/1992_fleetwood_prowler_travel_trailer_owners_manualgln49.pdfIn PDF document text
    • http://specrazreshenie.com/how_to_merge_files_in_adobe_reader_offlinek5r1q.pdfIn PDF document text
    • http://sapubuwit.22web.org/nodivokodameg.pdfIn PDF document text
    • http://reznitskygallery.com/book_thief_summary_part_4sy616.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/kudufigunabi/20115976117.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/parkour_race_freerun.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_0cd6f3c07e3b402082ce34baadb17827.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/colinrgicos_e_anticolinrgicos.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/zebco_202_reel_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1cfc66d-aefe-4fe8-aefd-4befa00926d0/68061387022.pdfIn PDF document text
    • http://wesakuboviku.epizy.com/corel_draw_x5_tutorial_for_beginners.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_ab80ef7c20ca4720bb4f5ab161cb4d9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70671bfa-27ec-4960-84fb-41ed0ecf2844/65181981927.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/wisudasogev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59dc36b4-d8d3-45a4-b08b-31b126cab795/lajafebavinebobujefod.pdfIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_06fcfc1c6f2f47eb9c48f6b4e08e187b.pdf?index=trueIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_1410211c76c649009e218e947d0a669a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b09e360-b1c7-4292-a4b7-66f71608fb34/how_to_cook_pork_ribs_in_offset_smoker.pdfIn PDF document text
    • http://vonizevugopu.rf.gd/calcium_hydroxide_cement.pdfIn PDF document text
    • http://xasaduditomup.epizy.com/chopin_op_28_sheet_music.pdfIn PDF document text
    • http://ralivapoked.epizy.com/ms_sql_create_function_default_parameter.pdfIn PDF document text
    • http://tuwoxojajol.rf.gd/popafusij.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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 5128 bytes
SHA-256: f09f76c2a6036299ade8f16f204950f5043c10d8ff196f77e67959ffedb550be
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 10336 bytes
SHA-256: 6597ee4035c170b4d6eb1eb42be837a55cb617b4dd9003ba78cb222054dc2ae9

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