Malicious PDF — malware analysis report

Static analysis result for SHA-256 17753cf1d3fc3456…

MALICIOUS

PDF

76.7 KB Created: 2021-04-02 13:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3457a3c9497a6266670daeb3b1ba69a9 SHA-1: 5ad020c12a67622cd5ba9ff9c07b5f08015e83f3 SHA-256: 17753cf1d3fc345627db048f58a472489f3c67ce7fa832d1a0b8ca5422a25a5d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting it functions as a link farm. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest the primary goal is to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://noviviludizafim.iblogger.org/dyson_big_ball_multi_floor_2_vacuum_parts.pdf
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5ffa1104e7470.pdf
    • http://libizusuro.iblogger.org/57185809282.pdf
    • http://xijipeva.mypressonline.com/accident_proneness_theory.pdf
    • https://cdn-cms.f-static.net/uploads/4389107/normal_603352dd0b39b.pdf
    • http://fewudutizoxom.medianewsonline.com/polycab_cable_price_list_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4491688/normal_5fc6d06ae2f98.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=is%20there%20going%20to%20be%20a%206th%20twilight
    • http://lamekukibudinos.epizy.com/leckie_and_leckie_textbook_answers.pdf
    • http://dojidusajotat.epizy.com/biology_form_4_chapter_1_notes.pdf
    • http://nuxizutize.rf.gd/75079098303.pdf
    • http://debumiputun.rf.gd/18717687518.pdf
    • http://nasedelowose.rf.gd/32697518302.pdf
    • https://uploads.strikinglycdn.com/files/fdb7ba4a-7b67-47ee-b853-18dbdb7428d9/nuxisuxosabotebopojoge.pdf
    • http://dabevejef.rf.gd/what_methods_did_suffragists_use_to_bring_attention_to_their_cause.pdf
    • http://ximevenekitag.rf.gd/verusutibuwaxux.pdf
    • https://uploads.strikinglycdn.com/files/28e581e6-b93d-413c-abb4-b0a86d587eb3/answer_sheet_template_1-50_word.pdf
    • https://uploads.strikinglycdn.com/files/118f3f3b-9e4e-4d60-9950-07977907b25a/materials_for_civil_and_construction_engineers.pdf
    • http://topufopotu.epizy.com/free_sheet_music_for_clarinet.pdf
    • http://votoromuw.epizy.com/wevewakudetal.pdf
    • https://uploads.strikinglycdn.com/files/577f6aa5-9b4e-40b4-bda6-073eeeef2961/18385788778.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_off0000edae.bin
1c4ed4de7ea37adab9e0743fe26a3f2472d772dcfca8b445839916cb12defadd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 5268 bytes
font_01_sfnt_off0000ffa9.bin
e371873c85a50a0fe520be0ddf377f9c2084a42ac4d59a9b107e1254d1c579a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 11108 bytes

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