Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd03b6fe85f8bdc…

MALICIOUS

PDF

78.8 KB Created: 2021-04-15 01:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2b61cd04ced7415d8d798987466b68da SHA-1: 5c0e838760bef735a47b01b0881781ba9c700669 SHA-256: efd03b6fe85f8bdce3300c7009a1ea84b5d6202f3d9bfbe34b9cf572be451a0c
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 0.9997

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.
  • 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://crophysi.ru/strik?utm_term=feriados+2022+gobierno+de+puerto+rico PDF link annotation
    • https://cdn.sqhk.co/nogorodizet/ibAhjCI/my3_top_up_online_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/hbfjiMQ/sekonic_l-_308s_light_meter_review.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/gdLhdTO/4_pic_1_word_daily_puzzle_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/HjjibdQ/mother_earth_brewing_nc.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/iaWidxg/instructions_on_how_to_make_an_origami_dragonfly.pdfIn PDF document text
    • http://farunoraxukiz.getenjoyment.net/boletin_judicial_estado_de_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/rokogikapo/6iegfhc/19658299254.pdfIn PDF document text
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/7396536.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuvapexal/HgfAicl/tap_tap_computer_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/gjmgdgc/patagakapoje.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/fases_da_carcinogenese.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/hejbjju/hill_climb_racing_2_rotator.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/zKjdZFk/98643403598.pdfIn PDF document text
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/041b9c6ef7b.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/CjbbgdR/56802639273.pdfIn PDF document text
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/3678647.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/microlife_blood_pressure_monitor_replacement_parts.pdfIn PDF document text
    • http://zuputes.atwebpages.com/mufus.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/50826689803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1b71d3-7c0f-4847-9e83-d8764001dad1/which_country_has_the_highest_gdp_per_capita_in_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3904644-e44f-460f-9a5a-53f3ee599d2e/how_stock_market_works.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_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 5580 bytes
SHA-256: a54b4a54a5ff3066fdc7446fa560f7199cf9434400fd93dad4d45cb149e0b8ff
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 13264 bytes
SHA-256: 7f1d1a9b50ee71e222c32e5ba0df5f03cbe9cf4683a09d0ef65f0ac24400c893

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