Malicious PDF — malware analysis report

Static analysis result for SHA-256 a780396fef6dbf3d…

MALICIOUS

PDF

77.6 KB Created: 2021-03-18 15:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 85480df0d179add07ee1c05d0f01f0d2 SHA-1: bc3ff23ffd5db0f4f678e5c4f10fbfb9af08f022 SHA-256: a780396fef6dbf3d58dee5c0cb8807fc380a7ef34d1ba0f869cae3b6066a8946
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://kuzutuzo.ru/wix?keyword=rwby+fanfiction+jaune+x+team+ndgo PDF link annotation
    • http://fejavodexata.getenjoyment.net/forgotten_realms_2nd_edition.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/bodugexo.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/66238489042.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/7Mf8jiN/zusagosefebelimadezebozip.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/XAp7igg/hay_day_game_cheat_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/igaffge/rust_prevention_devices.pdfIn PDF document text
    • http://tekplafond.xyz/pc_emulator_for_windows_87c3zc.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/keto_living_cookbook.pdfIn PDF document text
    • https://cdn.sqhk.co/nisifowisom/zihJ5hf/camscanner_software_free_for_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369315/normal_5ffd1a6ce9436.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380674/normal_5fcaa9640bb3e.pdfIn PDF document text
    • http://dronextactical.xyz/jesus_storybook_bible_christmas_bookea65l.pdfIn PDF document text
    • http://save50it.info/gumekixufiropuxekumeg611t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sefipa/72801726818.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/garilawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0adba761-2b7a-4eff-8196-24477a46f1af/schlage_keypad_lock_not_engaging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a712bcb-349f-4146-895d-18120c7c7a34/tewir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf88ada-c2a4-44c3-8ba9-2dbb14ef567b/philips_sensotouch_3d_replacement_shaving_heads_-_rq12_73.pdfIn PDF document text
    • http://lutepotazor.onlinewebshop.net/tafukowapusid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f9dc7e-fb46-4c1a-bf96-af7e5d8b0905/what_is_the_best_concordance_of_the_bible.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_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 5520 bytes
SHA-256: f98706e3dd1f35bd0a11e4133818aeedc97e23b30351fc2ab7c7e29be5df6f5c
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 10732 bytes
SHA-256: f60549998b1f4cd97df107631c8b602e7c31a1e2fccc12cf054fa4a327342d39

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