Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67b43cda1b3622b…

MALICIOUS

PDF

82.8 KB Created: 2021-03-16 11:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 015cb434b156a2ac7598d90fe131d93a SHA-1: 2c6193d0412ec132fad1067fa231f2c14742b671 SHA-256: b67b43cda1b3622b4e1745008b6973e48b5cf83fa6eed2a4659897dfa4d6d269
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 0.9998

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://crophysi.ru/wix?keyword=charge+of+potassium+chlorate PDF link annotation
    • http://pidawiwosoda.iblogger.org/chauri_mastarwa_se_fasal_re_song.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/kixaler.pdfIn PDF document text
    • http://tortomsk.ru/dexanabosinidowitoxx4.pdfIn PDF document text
    • http://presente-top.store/cartoon_movies_website2o1iv.pdfIn PDF document text
    • http://dezlice.ru/ibn_arabi_actor_ertugrulsnh9b.pdfIn PDF document text
    • https://nepefesin.weebly.com/uploads/1/3/1/4/131410606/91f54.pdfIn PDF document text
    • http://afracheat2.xyz/88509576209lis1m.pdfIn PDF document text
    • http://metalllift.ru/information_technology_project_management_certification_online_coursesuf409.pdfIn PDF document text
    • http://penaleduduzib.iblogger.org/geomorphology_book.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/915258bf-1838-40fd-88f0-8a523f623fd0/nubafogof.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/causes_of_unemployment_in_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f08771-d06e-4c72-95f0-a13cfe4e3336/walking_in_a_winter_wonderland_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/monabilul.pdfIn PDF document text
    • http://pizibajavodup.epizy.com/how_fast_does_a_250cc_moped_go.pdfIn PDF document text
    • http://lirepemewepe.rf.gd/samsung_galaxy_grand_prime_plus_hard_reset_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/57477483785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7bb18b5-b1ed-417c-955c-04e18ea747c4/bemadiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8915fc-bb0b-4f18-a450-da9077ef5b28/fikeserudasisi.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/20351155552.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 6492 bytes
SHA-256: d2077f5d6d5b1d677d9b6d000eb087611a047961d42ceeb980acba3b54af8b85
font_01_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 5332 bytes
SHA-256: 3a3bb53aaa1cb93d377f7efb5fb8e52e863847e67dfb5957735a8cb2fa4f67c3
font_02_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 14496 bytes
SHA-256: 0c4d2801d8c2bd155337375730d4e8ee5c1c0251750ba43d15fabb2360029008

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