Malicious PDF — malware analysis report

Static analysis result for SHA-256 408c525169c22c97…

MALICIOUS

PDF

70.4 KB Created: 2021-03-17 12:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3ef0d05902c2382f53fc43400845de92 SHA-1: 1ebb563c2e62b515ab238713206e4c424521f579 SHA-256: 408c525169c22c973122bebc9e977811b2ecb6abedb9031a686c841e7030006c
186 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 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.
  • 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://druttle.ru/123?utm_term=ancient+greece+reading+comprehension+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499002/normal_5fd348522375f.pdfIn PDF document text
    • https://cdn.sqhk.co/ridetalazo/fzn9ibz/sotiv.pdfIn PDF document text
    • http://bigtittybella.com/alexander_tamil_movie_free_downloaddwb3i.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/qwfji4q/smurfs_and_the_four_seasons.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/UivkCIF/ponisasosuxabobebadiz.pdfIn PDF document text
    • https://dosabaret.weebly.com/uploads/1/3/4/8/134861273/gowadumu.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/assam_district_map.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/28105440579.pdfIn PDF document text
    • http://elinekici.online/where_to_place_pads_for_tens_unitekr1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_60385e1fdb1c0.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/64941756591.pdfIn PDF document text
    • http://cosmosqrab.online/the_birds_work_for_the_bourgeoisie_song3knrt.pdfIn PDF document text
    • https://jubolovewo.weebly.com/uploads/1/3/1/4/131453214/2972b01fed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_05f7f2bf79d641a1aac8a993868dc5d9.pdf?index=trueIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_4b2b684d6962435c8f6314874634835d.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_3f84e0ef389b48aaa4a22d110d1f7ac7.pdf?index=trueIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_4173eac274ce4dceb16fd354cdafecc3.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_off0000d66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 5684 bytes
SHA-256: 90b6ee92db8c3f141da8dd25813bce712494d998c3a00389f09e24a1899da5bc
font_01_sfnt_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 10028 bytes
SHA-256: 3ed39a671d29259e779056671344192d394ba04f65aaf01c2ec85d81df223f74

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