Malicious PDF — malware analysis report

Static analysis result for SHA-256 203d3f08128d7e11…

MALICIOUS

PDF

77.2 KB Created: 2021-03-03 14:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f642d2ff6225add21a6803c38b8a97e6 SHA-1: 1f205c8d9344948eff9048439dc80f8826990227 SHA-256: 203d3f08128d7e11b3737787f987d959d0e5ab1a0c42782ebf8ecd0daaa74c1e
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous external URLs, some of which point to disposable hosting and are part of a link farm, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to URL generation, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=how+to+change+my+address+on+my+license+indiana PDF link annotation
    • http://ruguwafe.scienceontheweb.net/43444150781.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/power_pressure_cooker_pot_roast_video.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/american_megatrends_keyboard_detected_but_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5fc8294d8e0c5.pdfIn PDF document text
    • https://dexatasudawuge.weebly.com/uploads/1/3/4/4/134477966/guxegewiwujiz_kuravojuvo_nonijunafeguvi_jevibivimi.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/guvezunumifer_nemonike_wowamoz.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/how_to_fill_up_a_ronson_lighter.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/7334119.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/durajenakupi-lusewatip-domefozo-nepod.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/mksap_17_infectious_disease_free_download.pdfIn PDF document text
    • https://fudakima.weebly.com/uploads/1/3/0/7/130739810/ropewowupaxob-rivofubido.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/java_enterprise_in_a_nutshell_3rd_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_601ef44d4ccaa.pdfIn PDF document text
    • https://xuwowazasoko.weebly.com/uploads/1/3/4/0/134041707/zisutosodolej_kaguwis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donijexufenu.onlinewebshop.net/how_did_world_war_1_affect_europe_economically.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/3159710090.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/free_sap_accounting_software_latest_version.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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 5508 bytes
SHA-256: ea376b20fdd3d01c59368f17e461d723d3335dda80613fb4453c491a8ccf5a3b
font_01_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 10388 bytes
SHA-256: b60aca99f05b233c39e4c7189552cdd0103dc06d9ab2fdf92972add6300144f3

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