Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f876ef1357c251…

MALICIOUS

PDF

78.8 KB Created: 2021-03-22 22:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0686f504f0409e530cbb00d217d5eed9 SHA-1: 7329049e8f03112a9342df68caa277a1e61ac3e9 SHA-256: 72f876ef1357c25149ea374e826c384776986b91f7e0eb8701df19fae42febd3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting and suspicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering.

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://fokemale.ru/strik?utm_term=arduino+starter+kit+price+in+ghana PDF link annotation
    • http://yewes.fun/jepomavemivizk76t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454162/normal_603c52872ae8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426071/normal_5ff3797cdcade.pdfIn PDF document text
    • http://ezfix.asia/map_of_the_world_with_equator_line1h2ap.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/9v6MMij/62757980184.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/kewikewugajadlk9pk.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/hggghgf/army_green_service_uniform_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_60565a5f6ed7c.pdfIn PDF document text
    • http://xumugawejal.scienceontheweb.net/85374582672.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/Fbejj8C/famojupofetaginuxuwe.pdfIn PDF document text
    • http://pakupuxojopef.getenjoyment.net/meaning_of_development_planning.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/injective_and_surjective_functions.pdfIn PDF document text
    • http://kesisekojabaz.iblogger.org/how_much_is_michael_douglas_net_worth.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/zakewakamewa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8c9db57b-3ac2-4a05-8e92-c2fe05245471/el_hobbit_un_viaje_inesperado_version_extendida_bluray.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3d23bf-a4bc-48d8-9867-005dcb01e8e4/owl_city_-_in_christ_alone_i_stand_free_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2cc6f0d-a148-42b0-a076-7192b7a749fb/72765884936.pdfIn PDF document text
    • http://govuwetubor.epizy.com/guacamelee_2_ps4_trophy_guide.pdfIn PDF document text
    • http://zelagipu.rf.gd/15772650869.pdfIn PDF document text
    • http://telijekiw.epizy.com/common_chinese_symbols_tattoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1d6079-7d18-4a01-9bfb-9f5db6fd8098/fegalasagipiwenujejusiwo.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 5240 bytes
SHA-256: eeb1b0478ac8bd9c8b0e70382a12abd027a384767f8a4552cd9db5cdaa6d9745
font_02_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 11160 bytes
SHA-256: 1b89072258b4b2232c3e10a54eeee4b78d9415e00327af5d3e80f27f3868eafb
font_03_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e