Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f61efc00552520…

MALICIOUS

PDF

159.6 KB Created: 2021-02-09 12:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5cb3abd6c2a1544f7c58b2fd63506a33 SHA-1: 934f264ee2df590f2b1ef65d52a4e4b9a001a953 SHA-256: f1f61efc00552520d5809c62f25fc53d4746f42f62d66fcf3947edd7447f011a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external links, many pointing to disposable hosting and using UTM parameters, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF's structure indicate it is designed to redirect users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/aws?utm_term=dna+amplification+by+pcr+pdf PDF link annotation
    • https://cdn.sqhk.co/riketumes/ifjdhd7/4249973315.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/daketepubitejof.pdfIn PDF document text
    • https://rodavilimagenub.weebly.com/uploads/1/3/1/3/131381679/61338.pdfIn PDF document text
    • https://vopuxobud.weebly.com/uploads/1/3/5/9/135974080/3280449.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/MPgfjjD/65891444449.pdfIn PDF document text
    • http://reduslim-sitoufficiale.site/printed_circuit_board_basics_for_dummiesex8iv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5fd3ba42cf73c.pdfIn PDF document text
    • http://acgmgroup.ru/baal_veer_photo_editorlfrk7.pdfIn PDF document text
    • http://rm-swis-mine.com/chicken_invaders_3_full_version767r7.pdfIn PDF document text
    • http://bigmagazin.xyz/30589593474xxdno.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/Yjfnhhc/precious_metal_prices_today_uk.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/1033973.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/vitelitubovuluj/lean_business_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/92871232142.pdfIn PDF document text
    • http://zatojuwetowoj.rf.gd/2185811185.pdfIn PDF document text
    • http://jexiduro.rf.gd/adding_subtracting_multiplying_dividing_negative_numbers_worksheet.pdfIn PDF document text
    • http://bixasejefo.rf.gd/gepazuzorojupi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00023abc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x23ABC 29696 bytes
SHA-256: 5a492155e3f4efcd65ae433a73fe717451d76d07de2bc8a0ad3b4b079c31dde6
font_00_sfnt_off0001fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEFB 5364 bytes
SHA-256: c0f93aff95040fb609f2f31804e8f033f6e3d125920b84c25468e2e3a7a7c29f
font_01_sfnt_off0002112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2112E 12980 bytes
SHA-256: 9e5c41f8fce7c3742ac22ade5124e66de5619f85018124ddb0094a4ac74756e3

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