Malicious PDF — malware analysis report

Static analysis result for SHA-256 081385f6a23b960a…

MALICIOUS

PDF

66.3 KB Created: 2021-02-28 15:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b56c1d5f723bfba604400c4570d45508 SHA-1: 936403025ce38e1cd77d982db0d3cf7ee9602e86 SHA-256: 081385f6a23b960a55a9150cba38804bebf019bc974871c20cfa02e4deb0cd4f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body, though partially obfuscated, contains a lure related to appliance repair, directing users to a suspicious URL. The presence of external URIs and link farm heuristics further supports a malicious intent, likely to redirect users to a compromised site for credential harvesting or malware delivery.

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://pelibifir.ru/123?utm_term=how+to+replace+belt+on+kenmore+dryer+110 PDF link annotation
    • http://begemotiks.fun/819030729955yst.pdfIn PDF document text
    • http://copyrightshelpscenters.com/is_sun_and_earth_capitalizedym7so.pdfIn PDF document text
    • http://kawolamekepe.22web.org/gipadeti.pdfIn PDF document text
    • http://simkosa.website/willard_spackman_terapia_ocupacional_12_edicionwoyoa.pdfIn PDF document text
    • http://dle-tpl.site/bexisonatotulerh7u99.pdfIn PDF document text
    • http://policyhelpcenter.com/catfish_cooley_videos_fireballd2wlq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463792/normal_601598a03771d.pdfIn PDF document text
    • http://xoxunanodu.22web.org/skype_phin_bn_mi_nht_2017.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/pajukovuxetu/gatujaxepavugane.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/canticle_of_the_turning_piano_sheet_music.pdfIn PDF document text
    • http://misibumisap.rf.gd/depression_screening_guidelines_2019.pdfIn PDF document text
    • http://daxokefi.epizy.com/how_to_crochet_a_circle_to_start_a_hat_for_baby.pdfIn PDF document text
    • http://masosoxejonejov.rf.gd/wamsutta_fitted_sheets.pdfIn PDF document text
    • http://jemibare.epizy.com/nafaritamowox.pdfIn PDF document text
    • http://womusosixedel.epizy.com/what_is_a_game_of_chicken.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_off0000c6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BA 5592 bytes
SHA-256: 9ffeac6c5084a6a44ed4be455eb0544a508041f45943e6aaa91e3b7c115d60ff
font_01_sfnt_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 10724 bytes
SHA-256: 10a2c2dd8ac94ae0013928e954d7cd515b5789474e58a66172ccf931c46ed205

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