Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c7bb917ff1ec37…

MALICIOUS

PDF

79.8 KB Created: 2021-01-29 12:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9cbadbc5f188a0d2168f5b6eaeaeda10 SHA-1: 98447c8919fafe5ed310ace0734db6e6afc8621c SHA-256: f6c7bb917ff1ec372ea2ea6eafb405e2ee79f07daa010d4a4febc5d2c637d912
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wb?keyword=how%20to%20get%20followers%20on%20instagram%20business%20page PDF link annotation
    • http://copyrightshelpcenter.com/74481093571uroci.pdfIn PDF document text
    • https://tupalomixesitet.weebly.com/uploads/1/3/1/3/131379559/dulawejukovegewu.pdfIn PDF document text
    • http://visionnew.xyz/taming_master_ch_25fdp85.pdfIn PDF document text
    • https://nebekateri.weebly.com/uploads/1/3/1/1/131164314/pisosawiwene.pdfIn PDF document text
    • http://raifaisentgo.online/kadebepikitenugefuximono3v05q.pdfIn PDF document text
    • http://apsmall.space/uk_weather_map_live_met_office9hj1l.pdfIn PDF document text
    • https://fokomawirofuteb.weebly.com/uploads/1/3/0/9/130969657/4426941.pdfIn PDF document text
    • http://ideal-it.fun/marzipan_poppy_pillow_patternqxq0w.pdfIn PDF document text
    • https://xipejefokodidub.weebly.com/uploads/1/3/4/6/134612454/reridif.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/dPhjgih/funny_stories_to_tell_your_crush.pdfIn PDF document text
    • https://rapalavosifezo.weebly.com/uploads/1/3/4/8/134886177/jeraletabiwegero.pdfIn PDF document text
    • http://uber-global.com/tamil_novels_in_englishojs3q.pdfIn PDF document text
    • https://mupililoxer.weebly.com/uploads/1/3/5/3/135302313/6e877.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/1209930.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/ehijaBe/sunbeam_ice_cream_frozen_yogurt_maker_manual.pdfIn PDF document text
    • http://ceiling48.ru/nixilupesezetova6qbdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ruzaganog/acuity_brands_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/detroit_lions_injury_report_week_4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 5296 bytes
SHA-256: 94e4d35ab744e65af616f4e8066e3626ef7a09f7438a8a83bd460708cf411cb2
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 11200 bytes
SHA-256: 0de3cc9fb16938e711b5463f71769b0c093f8a57f99bd0099053dbd1bfcbbce5
font_02_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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