Malicious PDF — malware analysis report

Static analysis result for SHA-256 5770cacc7723402d…

MALICIOUS

PDF

71.9 KB Created: 2020-11-24 21:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cccabf7f5d8ae43526f8dd0dfa0d90ae SHA-1: d8ecd4d5f04b8c60c86be9dea13f62e48f5f1bc4 SHA-256: 5770cacc7723402d4ff025923596980c8003c6f8f887965af326a76c54167994
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'trafffi.ru', suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' further support a phishing or scam attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffi.ru/aws?utm_term=perimeter+and+area+class+7+worksheets PDF link annotation
    • https://deruwatago.weebly.com/uploads/1/3/4/0/134096830/fovuzax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f8939f5a6c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_5f9eec1fee3fb.pdfIn PDF document text
    • https://fawawivog.weebly.com/uploads/1/3/4/5/134595284/tojotidokenos.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/ad803bfb-ce51-4362-8ffd-74c05f0b9dae/kujowowuvumu.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/tie_dye_t_shirts_wholesale_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/ectomorph_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/taduwepevoxubilogazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5350789-787e-4eaa-b99b-a64c11b14ede/tiditisagin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c73360b-2c9c-4282-8781-45491260d2d4/parent_recommendation_letter_for_teacher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b4ddb4-73c0-4503-aa4b-aec7de93fa57/tapuvizunarosewuvuzab.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC542 5416 bytes
SHA-256: a4f3d7e50cb8a73a66f01d680740b3fbc6362bd349d18908b2fe3192dc060154
font_01_sfnt_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 10972 bytes
SHA-256: 014aea8ed759e4a916037c22c1985b52bdf38f140d59e3e14a2046556710fa5b
font_02_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 16144 bytes
SHA-256: 25dc1b7d69cb91644f28a5d849e004c6f464f5b7ca2df743cc20f0bbd1bcfc9f

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