Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ba431319d8fddd…

MALICIOUS

PDF

84.8 KB Created: 2021-04-20 00:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 96e81dae15526c5e9c0140cb4d63d29e SHA-1: 0aa6c0518592e1e3a214385b4b3e2bbb65026ca7 SHA-256: 74ba431319d8fddddc913ea290e983fb9885dc3d9d63c7a4ccb1743932d5af1d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, indicating a phishing or malicious redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=the+exorcist+2016+season+2 PDF link annotation
    • http://rovanenafet.getenjoyment.net/6382523942.pdfIn PDF document text
    • https://cdn.sqhk.co/mowezeto/t7aihYX/fuvosesefunowubeba.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/jbagdvN/8386888116.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/eDVtMjs/digadakirunuranutira.pdfIn PDF document text
    • https://cdn.sqhk.co/sapugelezuf/djhuZsm/7767369243.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/SFr2ujf/1006880461.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/jadfguv/nekinejisamadigofon.pdfIn PDF document text
    • https://cdn.sqhk.co/bigokukanuf/cHhdjaU/collin_hill_rivals.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/gibjbK8/bloons_adventure_time_td_mod_apk_free_shopping.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/iiFDjdw/kilagalo.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/vopoge.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/1hbCpje/agent_orange_weed_side_effects.pdfIn PDF document text
    • http://damewonuseba.sportsontheweb.net/16167917087.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/palevijuj/honeywell_lynx_5100_white_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b59471-8b89-43d8-a5cb-b46c474efc86/maxobufow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb4be0f-be4b-40f4-aba6-f826c1823774/lewis_dot_structure_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/tabela_de_preos_de_carros_novos_portugal.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/norton_antivirus_cracked_version.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/tovelobaloxem.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/leotec_android_tv_box_4k_octa_core.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/ableword_editor_online.pdfIn PDF document text
    • http://sarutufasiko.atwebpages.com/frozen_shoulder_treatment_exercise.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_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 5352 bytes
SHA-256: 125e78955b843f57fdbb6c72a8abe97e295fb41cd14ad82aa22c2bedd7566532
font_01_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 20076 bytes
SHA-256: 1a5927aad89f23434f18b721d7a3ee9751d50702b71a5703616e0347624de75e

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