Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b82ac3f143cad8d…

MALICIOUS

PDF

75.4 KB Created: 2021-04-12 05:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a7f4f0994322b08933ff311a9db13d64 SHA-1: 5faddbb76dd1f155d3cd3311813623eccef9107e SHA-256: 4b82ac3f143cad8da5279898463bdb0b21c503be83844f6a66d14ea6560e198a
126 Risk Score

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 pointing to disposable domains, suggesting a phishing or scam campaign. The document body, though partially corrupted, includes a title related to 'duraflame electric fireplace' which is likely a lure to disguise the malicious intent of directing users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/strik?utm_term=how+to+use+duraflame+electric+fireplace PDF link annotation
    • http://levantegroup.net/mean_median_mode_grouped_data_worksheet_with_answersbbei7.pdfIn PDF document text
    • http://vovpomnim.ru/kukunozorasz8603.pdfIn PDF document text
    • http://freshnatur.fun/gademogasajiwafibucwd05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fdbb64e8dd98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_60262a52b436e.pdfIn PDF document text
    • http://opssmall.space/romipuwotajar5xti6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496170/normal_6062795ec7138.pdfIn PDF document text
    • http://kersita.fun/is_a_hypothesis_and_theory_the_same_thinguxl3h.pdfIn PDF document text
    • http://itfamily.pro/what_is_macros_in_excel_for_beginnersajcgc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368493/normal_6001e5e2e1311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_606ea2ab6c25d.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/polexebuj/gililove.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_f856aada61384d4eaf2041f740c7dd1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/202b636b-4536-42c2-9a0e-55fad73e4a03/filumijujadanibukofup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e83d4b-9963-4622-ba77-9dbe335dc894/power_supply_tester_define.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e13c8d-9489-431f-a3dd-f2474c17c72c/jilojidemojodasuzojuve.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_1b57ea9942fb4bff94aeab82fc80fd5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/short_video_maker_android_app.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_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 5356 bytes
SHA-256: 7c0dddfda5b25dfc8d63c44dc927048f4817fe96b9c05c232908fe6efac6ca22
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 10852 bytes
SHA-256: dc46885b696817eb4565825ff4118eb74987261d1c792abdd416698f80e43aa9

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