Malicious PDF — malware analysis report

Static analysis result for SHA-256 35af689ef214db36…

MALICIOUS

PDF

69.0 KB Created: 2021-04-06 00:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0189a177b942ff2bf3cd5f0dbbc6b597 SHA-1: 14f80c990dcefa6f37bcde2b101cdbfc3e179209 SHA-256: 35af689ef214db36e0cefbd9029d92bcad7335b2a795ad8ee04a36900f4a6e05
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates this behavior. While no scripts were explicitly extracted, the nature of the URLs and the detection suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=dish+manual+timer
    • http://funutilesezuvo.iblogger.org/shrimad_bhagwat_geeta_in_english.pdf
    • http://vulifux.66ghz.com/bogle_book.pdf
    • http://vurupilinimini.iblogger.org/camera_scanner_to_kndigen.pdf
    • http://kujamemapevubu.mypressonline.com/87716943527.pdf
    • http://gosoxegekiri.mywebcommunity.org/addition_reaction_download.pdf
    • http://luranowebereni.22web.org/fikuba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuwetixa.epizy.com/how_to_fix_a_kitchenaid_mixer_switch.pdf
    • http://katewamopexo.rf.gd/keep_track_of_your_finances_spreadsheet.pdf
    • http://digupekab.rf.gd/will_trx_help_me_lose_weight.pdf
    • http://matowozor.epizy.com/best_acoustic_cover_songs.pdf
    • http://nifiloxoburufi.rf.gd/popura.pdf
    • http://digimoxesimukus.rf.gd/venimirasurunegoza.pdf
    • http://sexililelaweru.rf.gd/fly_fishing_guide_school_uk.pdf
    • http://nugosipokudi.epizy.com/naviburogepatuk.pdf
    • http://zajobape.epizy.com/anycast_m2_plus_android_7.pdf
    • http://kugunimekuxaf.epizy.com/powuxexilitovino.pdf
    • http://vilatelisoto.onlinewebshop.net/tobekenuxapujewibi.pdf
    • http://jisijuvod.myartsonline.com/how_to_use_whistler_radar_detector_z-11r.pdf
    • https://uploads.strikinglycdn.com/files/41d515e1-1de4-49a4-be19-c74f7cb60bbc/best_electric_fence_charger_for_bears.pdf
    • http://lawazujazigefon.epizy.com/93538665859.pdf
    • https://uploads.strikinglycdn.com/files/310fa130-0084-458d-9f62-4e34f2435f09/70060385082.pdf
    • https://uploads.strikinglycdn.com/files/77ccc1e8-7ccb-40a9-b4c5-8d202bca559b/dolujuf.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_off0000d270.bin
bc7232aec658d2b44cca7718d648eb83de12fac9380b4c8ca2554df205525126		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD270 4924 bytes
font_01_sfnt_off0000e301.bin
e29a3e3ef72ec6270143fb9f374a23df78d9e9edb800f2e41d3f298b8066f07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 10520 bytes

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