Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41f9b6669a7b5c8…

MALICIOUS

PDF

71.7 KB Created: 2021-03-15 16:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3fdae72df87841b5c4d9ab4a0c7a1c92 SHA-1: 7b89fde7187078cc537bd8002607743e3a2401bd SHA-256: a41f9b6669a7b5c8270279947ff56b083f994f5fba711eada18616f28eeb6687
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 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 0.9996

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 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://pelibifir.ru/wix?keyword=130%252F90+x+15+tyre PDF link annotation
    • http://toppiksnack.xyz/panasonic_viera_th-50px60u_stand20j92.pdfIn PDF document text
    • http://copyrights-notices-helps.com/recap_of_game_of_thrones_season_1_episode_3tt54s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_604ae9ae0106d.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/gym_biceps_workout_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_602a457ee6b9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_600fb9b7c3af0.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/liste_adjectif_francais.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_60316d005cbbb.pdfIn PDF document text
    • http://goodsun.space/diferunesuzidarepzqwjb.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/nj_transit_bus_zones_to_nyc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_6016a97720731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_601a4968f071e.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/tosozojusozel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486353/normal_5ff53887ba729.pdfIn PDF document text
    • http://supernefritroller.xyz/ant_man_hd_imagesbt3n7.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/d4593474-5c3a-4c89-8d06-03f53f38c62a/hp_stream_11.6_laptop_64gb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49b62e8-a7fe-450f-8d75-f13d7efa2bb9/mozusikivoxojonotizokuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae3b49e-0533-4ebe-be82-85602963be22/bedoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01493d83-8dc1-4030-878a-d36a4a709fec/what_is_the_difference_between_a_regular_power_of_attorney_and_a_durable_power_of_attorney.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46904cac-3d97-41c2-a22a-d2e3463e02d5/what_is_wifi_direct_on_a_brother_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc7f039-33b1-4072-9c8e-fb36f826bea2/4597752487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7ba9fa-46d3-4593-b816-c5c972e1be9b/is_rainbow_six_siege_appropriate_for_a_13_year_old.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_off0000d040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 5008 bytes
SHA-256: 9b80c30b5c1e5f933db5fa639a4c30a3b68b68d8c9c916374b352e4888bf5c60
font_01_sfnt_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 15132 bytes
SHA-256: e43a5a728b874ecf6ce0b3ecb30a45f71f8d6a685484cf2f1dce6341c7beb1a7

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