Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ca82872ba1a74b…

MALICIOUS

PDF

68.5 KB Created: 2020-12-11 14:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5e9a9ca4307420af80dc6fb8f0cad2f6 SHA-1: 9b58c8de1966d39fab53f85dd56e11c58f0385f3 SHA-256: 41ca82872ba1a74b460f208d39fe81b60787bc30cba79ea77ef64cc03358648b
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 0.9998

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
  • 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://trafffe.ru/strik?utm_term=last+christmas+i+gave+you+my+heart+lyrics+karaoke PDF link annotation
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/noropemoku.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/9726988.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/af686824-9ed8-4330-b23b-6ea9ff0a7825/vibalogakikame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8428db-b249-4e8e-952a-70e72b26af15/the_cancer_cure_that_worked_50_years_of_suppression.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/biological_classification_worksheet_key_pogil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b108119a-4dff-4951-8759-99e25dbb2e2e/xewagajimadonodugopi.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/fomema_medical_report_check_online.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/64474700912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6def4d0c-8552-4833-9ae5-35311ab7ddf8/lumelugebegosusutapep.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3e66e18c5c478ec765b6/1606303334971/bsa_red_dot_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d0048f-d57b-43ad-be46-3ab6bed303f5/zagepalosesivasus.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/56425348523.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/82305534612.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28802bda9c57a97c88755/t/5fcbf108a87f9f1b19c1d416/1607201032960/paint_puzzle_pieces.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC77 5380 bytes
SHA-256: 27075af43728794d069d19d887de2596a62ea94ee74d3865fce84327be44db61
font_01_sfnt_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 2128 bytes
SHA-256: 18f47e14b033b9868918b882439b75cbf81e22a18dc542528a66a0b8b339fdc8
font_02_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 13568 bytes
SHA-256: 680a3d46e37d3788f86542c984477cd968950c4d48eafacfc1183c297eb03456

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