Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7c2d5654a971aa…

MALICIOUS

PDF

116.2 KB Created: 2021-04-08 04:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e9b21a34f9ecdbb20bb3dbd27c0937c5 SHA-1: 4d50de04ad9b559e0ed3c47d02b61aa9c40501bc SHA-256: 8d7c2d5654a971aa4b9a34a3736aa36459cfe8cf1672780714d0f6f97c3ca345
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The embedded URLs and the document's structure strongly suggest it's part of a phishing campaign, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jacksth.ru/wix?keyword=clinical+coding+workout+2013+with+answer+key+quizlet PDF link annotation
    • http://vogolimipogusoz.mypressonline.com/english_grammar_rules_bankers_adda.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/2020_us_open_women_s_draw.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/hQOnhdz/furious_death_car_race.pdfIn PDF document text
    • http://xafawotilujos.mypressonline.com/assam_map.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/bEhd8jg/usa_field_hockey_national_futures_championship_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/azWfhjj/new_york_company_outlet_store_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/jerizukop/ididVzJ/75819158851.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/rudram_chamakam_kannada_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/gebqNfV/contract_whist_app.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/que_opinas_sobre_la_educacin_a_distancia.pdfIn PDF document text
    • https://cdn.sqhk.co/savekedeg/VIibiaK/pizepegusesu.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/iaAhikx/pottery_making_illustrated_back_issues.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/1127324839.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvifilezaja/gj6zw60/jinogetewalamomezosumeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4da44922-6ee1-4515-aed7-54c3d6b51f77.filesusr.com/ugd/243a28_405a74e0a1684af9adefce21d0aace7c.pdf?index=trueIn PDF document text
    • http://tijepexaran.epizy.com/ripox.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/26551531073.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_518a9bbcd150447fbebe87bbf608bf3d.pdf?index=trueIn PDF document text
    • http://bexexakik.myartsonline.com/bukhari_bangla.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_7780d8577263454a9086412efc0bfc78.pdf?index=trueIn PDF document text
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_b6c170b21a1247d1a092778caf308d59.pdf?index=trueIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_4949fad673614f1ab56bd23e362a5892.pdf?index=trueIn PDF document text
    • http://pedijuwugeta.rf.gd/81695127943.pdfIn PDF document text
    • http://feniwuzisegutol.rf.gd/lmsw_study_guide_free.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_off00018723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18723 6032 bytes
SHA-256: b40d104f316525cbbd77a7b3481ab9e9c1b928acbc49a86006a534b7ec83384a
font_01_sfnt_off00019bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BBF 11420 bytes
SHA-256: d61dbeba530372271133e596864bc7b78ff21ed55b792c88b4116c6ec219c3e1