Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d78e9d2a342890c…

MALICIOUS

PDF

80.2 KB Created: 2021-04-10 09:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c6004ca27a7da81c48d6531524980bc4 SHA-1: 727a31ba637180c00ad2ae04c527b1e7095f5bcc SHA-256: 2d78e9d2a342890cb7a6f175b21398e6c619ac38d26f92ff52d4f8f5fb861648
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The presence of multiple external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=p90x+classic+workout+schedule+printable PDF link annotation
    • http://eslivdrug.space/what_size_file_for_poulan_18_chainsawgqfzo.pdfIn PDF document text
    • http://esagafow.fun/crnica_de_una_muerte_anunciada_anlisis_realismo_mgico3mewn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_606d43d5b68c0.pdfIn PDF document text
    • http://avtovishki-msk.ru/fannie_mae_rental_income_worksheet_10390ayes.pdfIn PDF document text
    • http://emirofficialzm.com/gazuzilotofijiralilumur1fak.pdfIn PDF document text
    • http://zopetiwan.22web.org/pupunexevawamid.pdfIn PDF document text
    • http://supozupewurak.22web.org/zigidexipe.pdfIn PDF document text
    • http://memoduwufolugu.22web.org/tuzigoxavurapuxow.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/Dmjdt10/sabalinedebofiz.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/Bjeieic/gutexukapenavixidupaweme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5fdbe37aa3611.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/f51geib/11609957608.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/vawoginele/remove_navigation_bar_in_xamarin_forms.pdfIn PDF document text
    • http://xugowosapiri.rf.gd/awei_bluetooth_headphones_user_manual.pdfIn PDF document text
    • http://fasosurid.epizy.com/brochure_templates_free.pdfIn PDF document text
    • http://xonuzerupivivi.rf.gd/arduino_code_for_servo_motor_control.pdfIn PDF document text
    • http://tafoboverel.epizy.com/wimepavufe.pdfIn PDF document text
    • http://vidarepi.epizy.com/21061493134.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/use_android_phone_as_wacom_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/gijogedinegek.pdfIn PDF document text
    • http://kijekamazeju.epizy.com/zusetemubefolikususutapez.pdfIn PDF document text
    • http://wifobujaxude.epizy.com/natufopituzer.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_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 5824 bytes
SHA-256: a239c6a6137b1cd2d6931475e0b60cce3928ac0c3d3219726722677e3ac13087
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 11424 bytes
SHA-256: ba59f136ec894320c078c9030abb08865ec60d5d51bcefc26ad4db40f8fd093d

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