Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d78719203fb2d0…

MALICIOUS

PDF

92.5 KB Created: 2021-04-08 00:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b9a1113c339f96f4ae45954aacbb486d SHA-1: d69a2531dca2c222eaba1160015322a9bd4792d7 SHA-256: 40d78719203fb2d0a8e20bed151bad971ca85f4092b8664049ef32184a57c509
204 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. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/123?utm_term=mosaic+logo+reveal+after+effects+free PDF link annotation
    • http://cmb-societe.com/sipowun4ia5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487618/normal_5fcbd3c451713.pdfIn PDF document text
    • http://detonicufficiale.website/extreme_balancer_3d_ball8cqww.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458621/normal_606e1d8e98b7c.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/9038877.pdfIn PDF document text
    • https://pulamawuba.weebly.com/uploads/1/3/0/8/130873907/9a04572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_6041ca6a74669.pdfIn PDF document text
    • http://giveaway2020.info/what_is_challenges_essayywebj.pdfIn PDF document text
    • http://prizinsta.online/the_trial_of_spongebob_squarepants_who_killed_mr_krabsgi8af.pdfIn PDF document text
    • https://tokuguzeg.weebly.com/uploads/1/3/4/4/134464653/puwoxisilorotegu.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/fexuror/denotisolikipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59694a1a-4677-4fc2-90f0-9b2b6784ea1a/transcribeme_style_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76c12f0-a55f-40fe-bf79-cbd606062230/hindi_alphabet_worksheets_with_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/what_does_seeing_111_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/18251201695.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/tarawoxemefol.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/lidar_lite_3_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/glucose_test_report_time.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/matthew_hussey_will_he_marry_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682f8e92-d916-447d-963d-c4909715daf9/zumezisixixitiriziwaveda.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/vamemogapep.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_off00012a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A91 5116 bytes
SHA-256: bb1ceab0fc6a95d96f18b294fe0e3ff40fa1b9065b14cf368f045a0e49b653e6
font_01_sfnt_off00013c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1E 11348 bytes
SHA-256: 76a805ee8fd4e469dfa9260d6a956c04ea28b3bc477124ff7661b6d9c3c6b3b4

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