Malicious PDF — malware analysis report

Static analysis result for SHA-256 af560ab1732d310e…

MALICIOUS

PDF

71.2 KB Created: 2021-03-04 23:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 35bff0e0086cb1c12197f27e956076a6 SHA-1: 148900985f1c9ba88f470f6e8fff1b183efa79fa SHA-256: af560ab1732d310e052a539a239e7cf096bf5f5a675c8688f1fb87fd8b2b7306
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9997

Heuristics 5

  • 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://zajinet.ru/123?utm_term=dunkin+donuts+coffee+sizes+oz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426547/normal_6010a2970a7f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_600e2130e32ac.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxazagugura/cY6aBij/super_moggy_adventure_run.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5fe9ee43d05a5.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/5191961260.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/handmaids_tale_watch_free_online_season_1.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/iihgNzZ/country_life_harvest_day_mod_apk_wendgames.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/ihWB2Ps/car_mechanic_school_florida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381340/normal_5fcbab1018eb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410415/normal_5ff77f9d3e7ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403672/normal_5ffc85b762f43.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/bjbibgg/xejupidetowogevukowoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_f7f2877cdb384d019fdf2055d1902e5e.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_5dcf099fbe954a56a7e3f96484d914f9.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_a5a9b184d39345edaae9f171af19cee7.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_1921f6aa3b0344109a5419cc9d39f269.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_dd2564913fa84cde8f002a40b658753c.pdf?index=trueIn PDF document text
    • http://tulajadulixo.myartsonline.com/ragarasozapewanemato.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/how_to_write_grants_for_nonprofit_organizations.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/the_long_haul_book_cover.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_5abdf6563d6a44ca96d8de886fa239a2.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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 4792 bytes
SHA-256: e9b0be93021caef9aa409781087426b7dae17b3b3774363f164b2463e8bc099b
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 10720 bytes
SHA-256: d8eb93e4f546c3f5b47256974060e2ad1f0882dad4c3bd9e913411e3b10e0d5e

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