Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a4a90dbf0b182c…

MALICIOUS

PDF

79.8 KB Created: 2021-04-06 01:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 718608e48d254582768c2040ef433b4f SHA-1: cf0f786f29a559941ce4357f5547ea2436839dce SHA-256: 98a4a90dbf0b182c8901c83f83349a616d1a6c44021abd3fe23f56496aa556fa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. The document body appears to be malformed or truncated, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=son+chiraiya+akshara+bidaai+song+video PDF link annotation
    • http://clientbluebadge.com/tepuvetidutadoroguwubukumx9fuv.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/f2fd75148cdc5a.pdfIn PDF document text
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/9981b7dd30.pdfIn PDF document text
    • http://purpless.vip/business_communication_soft_skillsu4o4o.pdfIn PDF document text
    • http://fallofelin.online/pumuwipaguseredupidusekok4nllf.pdfIn PDF document text
    • http://afracheat6.xyz/jofolulovow2kkrf.pdfIn PDF document text
    • http://getdouche.xyz/10th_class_maths_textbook_english_medium_downloadnl8nu.pdfIn PDF document text
    • http://zivudib.66ghz.com/guvowolukopurigi.pdfIn PDF document text
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/xolifofele_pogebadifafuk_tenamabuga_nenewa.pdfIn PDF document text
    • http://idealica-official-it.website/kebululapimepujdn6yw.pdfIn PDF document text
    • http://mikrotikwizard.com/the_cat_in_the_hat_2003_full_movie_online_freea01tm.pdfIn PDF document text
    • http://inertbhjbj.ru/what_are_the_parts_of_a_brother_sewing_machine3028c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://taraxibelojexa.rf.gd/bharti_axa_life_insurance_policy_surrender_form.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_fef5476cf911428095a4c8971642649b.pdf?index=trueIn PDF document text
    • http://guridej.epizy.com/fishing_rod_guide_terraria.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_f4da7c7080eb46108dfc97510dcbe500.pdf?index=trueIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_6dcdf76bc985496fb4908ee6774aee40.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_97d10c06d077498aac2e958d0409a9d1.pdf?index=trueIn PDF document text
    • http://ravuxigud.epizy.com/madhepur_madhubani_weather_report.pdfIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_69bceeadf5df4df78bfa53c61de1ed66.pdf?index=trueIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_3e781640aaca45dcb7167ce8f97304dc.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 5636 bytes
SHA-256: 43a2f3431a84bb210c2348fbbf50df0fef66b5e2999f30703c58a9f442c03cb3
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 9960 bytes
SHA-256: e685c57a532f659c0661ff351a6d80399960e4309159780188d06721a1fd512d
font_02_sfnt_off00011475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 8892 bytes
SHA-256: e1a34ad073d40997b1ad0d2ba130e031f0bd84192c4576e3cba995bf9fbce4c2