Malicious PDF — malware analysis report

Static analysis result for SHA-256 825031b2d3c9f700…

MALICIOUS

PDF

78.4 KB Created: 2021-04-29 01:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e51105edafb117d2c9d05d97fd95697b SHA-1: bbb488170ee3612290909212fc0a9a5247987bc8 SHA-256: 825031b2d3c9f700f81dd3a68fc743f763f8db41f65f90a1a09e9dfa726f6c4e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a primary focus on a URL that appears to be a search result redirect. The document body, though heavily obfuscated, suggests a lure related to a common search query, aiming to trick users into clicking the malicious link. No scripts were extracted, but the presence of multiple disposable hosting links and a link farm heuristic suggests a campaign designed for broad distribution and evasion.

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://botokaw.ru/strik?utm_term=how+much+does+it+cost+to+rent+a+harley+rake
    • https://vesukinixemijuw.weebly.com/uploads/1/3/2/6/132696016/7150373.pdf
    • http://veselutut.mywebcommunity.org/moregisikexufu.pdf
    • http://matcobzor.ru/ozark_trail_focusing_led_flashlight_battery_installationioxfw.pdf
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/zepezogimiguko.pdf
    • http://tuwimig.scienceontheweb.net/ages_and_stages_questionnaire_18_months.pdf
    • https://botefajom.weebly.com/uploads/1/3/4/6/134690565/2904162.pdf
    • http://jajolamuseku.medianewsonline.com/3335224796.pdf
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/957e5741b59b31.pdf
    • http://pimifawimonidij.mywebcommunity.org/skyrim_level_100_smithing_fast.pdf
    • https://vebuwume.weebly.com/uploads/1/3/5/3/135349689/3840979.pdf
    • http://ighelpcenter.xyz/dawefolagitavapojilokcvld2.pdf
    • http://setavifisotater.22web.org/performance_appraisal_theory.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/892cbd61-25c3-4ec0-8cff-13eea4e81663/jujepabakegisibazowonimi.pdf
    • http://dusiwesidixe.epizy.com/fusexozoda.pdf
    • https://uploads.strikinglycdn.com/files/2c2d6ca5-8b1d-4137-97bd-6aae002926b1/sun_joe_spx3000_directions.pdf
    • https://uploads.strikinglycdn.com/files/15359797-62d8-45ce-992c-682a58d46576/what_does_the_color_green_mean_psychologically.pdf
    • https://uploads.strikinglycdn.com/files/de9a3fae-4024-43d2-9240-5df3bd8b8a84/keselivujituz.pdf
    • http://tupusivamiguta.rf.gd/burkert_valve_8691_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f4.bin
0841e0ef5e707101e120d3b27b146f1a1b8c0ec9472425731c6ab5fb5550a07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 5396 bytes
font_01_sfnt_off00010435.bin
0d8979113208a0519ffde19c8adbd2150f14f67d6728f957bf9378bfd0164a6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 11768 bytes

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