Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0308a9f8ddcb41…

MALICIOUS

PDF

72.4 KB Created: 2021-01-26 17:04:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e82165579f825e553f5f7b562bce94e7 SHA-1: 7656f6900a045ca664c3c74193a2b8b16d969111 SHA-256: 2f0308a9f8ddcb41c12e88b9a1e1b61c04c727558b44475c7646e074af964e58
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one specifically using a UTM term suggesting a lure for a 'guide to crystal gems pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/123?utm_term=guide+to+crystal+gems+pdf
    • https://static.s123-cdn-static.com/uploads/4490376/normal_5fe318b86dacd.pdf
    • http://fuxukibegub.iblogger.org/mutovagenawuj.pdf
    • https://cdn.sqhk.co/mikevoponage/gcicpjj/daily_steaming_is_good_for_face.pdf
    • http://gulebamabixaku.22web.org/video_converter_android_2_pro_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4469834/normal_5fce567ea90e9.pdf
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5ff5996538752.pdf
    • https://cdn.sqhk.co/fomanazoravu/PHggtgh/the_archer_warrior_mod_apk_android_1.pdf
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5fef6df2148bd.pdf
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/riridetukiri_xazamida_dejiloxo_difuvuju.pdf
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/a02368bc.pdf
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/gudiwakogevewam_wapasij.pdf
    • https://dafebifu.weebly.com/uploads/1/3/4/3/134399244/pubulatuv.pdf
    • http://sovuxofi.66ghz.com/lejokevoduvalonemofodiwa.pdf
    • http://ropiwijubasa.22web.org/43173675886.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dogamesesokuj.rf.gd/totoker.pdf
    • https://s3.amazonaws.com/tuxexi/babu_e_rambabu_song.pdf
    • https://s3.amazonaws.com/wuzalugiseto/wejabitidiw.pdf
    • https://s3.amazonaws.com/mokamoba/menigasiwu.pdf
    • https://s3.amazonaws.com/vuraradaso/kopifuloxibi.pdf
    • http://dupunijasazo.epizy.com/86104916452.pdf
    • http://mesuwepuru.epizy.com/the_beatles_greatest_hits_album_free.pdf
    • http://wirirarosutuki.epizy.com/33369026389.pdf
    • https://s3.amazonaws.com/baxunaf/invitations_templates_for_baby_shower_free.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_off0000da0d.bin
a5038a37c848187ccc78b828973668e50e0c1ab23060efd4885b1f2bb98a9358		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 5608 bytes
font_01_sfnt_off0000ed18.bin
09fecd340d6da264d03abbc71ab26461a2cf8e1525724f95348c26e17eda0e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 12312 bytes

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