Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a832d5c5fae2675…

MALICIOUS

PDF

120.5 KB Created: 2021-04-04 04:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 62794fe45617d6214e627a7a21de3dd1 SHA-1: 662f6bd4e7a2114dfc71c98be5786ea561626ea7 SHA-256: 4a832d5c5fae2675b2edbfbf1d1127779d2938af2bfd386bb7883f813ae93215
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/strik?utm_term=sylvia+plath+books+in+order PDF link annotation
    • https://cdn.sqhk.co/kevovevude/cXzRhlZ/33365377222.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/fHpijje/grass_cutting_machine_for_sale_in_karachi.pdfIn PDF document text
    • http://lipenav.mypressonline.com/3444437167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_605efda4185c3.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidazi/rjjghgK/fulex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473053/normal_60023cdb03547.pdfIn PDF document text
    • http://plsale.pro/best_self_behavioral_health_niagara_street_buffalo_nyu9xr6.pdfIn PDF document text
    • https://cdn.sqhk.co/xawemubimaj/ieijA5c/90739183169.pdfIn PDF document text
    • http://expressvpn.store/foxconn_n15235_motherboard_lan_drivers_for_windows_xp_downloadh6anl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_6047384fb7053.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/english_stories_books_for_beginners.pdfIn PDF document text
    • http://rodina38.ru/how_to_identify_a_diode_using_multimeterrwr80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487187/normal_5fce390c41d80.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/vp6ihjd/definicion_de_biotecnologia_vegetal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469358/normal_60547a55b0c90.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/bifadiwuwileji/jorujaguzidurevikizibe.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/71294442120.pdfIn PDF document text
    • http://fuzolegogi.atwebpages.com/homero_odisseia.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/596965793.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_off000199b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199B2 5516 bytes
SHA-256: d945077e5e14bdfc6d01e39f864eee2e9cef8857605313a45efe03ed7a4e6a6b
font_01_sfnt_off0001ac68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC68 12104 bytes
SHA-256: 45e517e5dab57e707f6c737a6583a7ab168e4c1e6a236c4d861c05b951d74a57

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