Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d0361cc45e2447…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 03:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 87bd17b343a6201686be5afc76d9746a SHA-1: df725093a56caa7e3cbb74b9a0525074025b4260 SHA-256: 73d0361cc45e2447f51bc2394bdbb347a1f397559fed044d2783701b3d72e077
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=oster+smoothie+blender+walmart PDF link annotation
    • https://cdn.sqhk.co/pozusonitid/gehfsm5/gamubov.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/jehdrjg/farinizalo.pdfIn PDF document text
    • https://cdn.sqhk.co/kiranagel/sy0Kwhb/makajipugilimabazebotilin.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/hhaYjb4/prop_hunt_code_fortnite_2020.pdfIn PDF document text
    • https://sibozigoguxo.weebly.com/uploads/1/3/0/9/130969143/6639475.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/ghdgjIE/40334011608.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/Izgiahh/epic_war_td_2_apk_obb.pdfIn PDF document text
    • http://kuvonej.iblogger.org/3888189719.pdfIn PDF document text
    • https://rovorakule.weebly.com/uploads/1/3/4/7/134774255/4562930.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/jgge10L/find_objects_of_type_unity.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/f6Wghjg/boxorabikev.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/jcieXjb/free_poker_texas_holdem_classic.pdfIn PDF document text
    • http://domifonupesif.iblogger.org/when_did_blood_sacrifice_start_in_the_bible.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/analytical_reasoning_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/evgenia_medvedeva_sailor_moon_performance.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_c707e97442bd46139a5bdda21f826996.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurafoga/rejemevizunirapevexixidi.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_1bcd2e8bc4934a0b936fb8f5bd0baa1a.pdf?index=trueIn PDF document text
    • http://wuzuferopo.epizy.com/barclays_travel_insurance_policy.pdfIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_2ff0acb565b949bb950d2c32283ee531.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wusone/how_to_play_bar_chords_easier.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_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 5324 bytes
SHA-256: 1b708afea932965715f0656c524889cf20ab8d1cef2b8d4b5c12c68d57aff342
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 10840 bytes
SHA-256: f5d4224097f7560c90c88d3d7e49b5d903db33ac8c4df0fb027ea0b95f1589b9

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