Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28dbfba1ac27f0f…

MALICIOUS

PDF

77.5 KB Created: 2021-02-12 17:22:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d06ab1fe687e639f44c64ee26b53a73a SHA-1: b2389dc000ddb0a904ac2f7e36c01f95468b006a SHA-256: b28dbfba1ac27f0f0a95ba4ced13efbe1fe68d0d564d02949da2e2254f4671aa
156 Risk Score

Malware Insights

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

The file was identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting an attempt to direct users to potentially malicious or SEO-manipulated websites. The presence of embedded URLs and the ML classifier output further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://crophysi.ru/123?utm_term=ernest+holmes+science+of+mind+pdf PDF link annotation
    • https://cdn.sqhk.co/zijopenuxafi/5ibX7ic/futerokeli.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/ghjhfic/5091144920.pdfIn PDF document text
    • https://vaxulisexo.weebly.com/uploads/1/3/4/6/134600260/c6ee377fd3.pdfIn PDF document text
    • http://itprod.space/free_bully_ppssppomz2z.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/metformin_xr_maximum_daily_dose.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/gedimuta/app_lock_old_version_history.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/instinct_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/2006_holden_barina_tk_workshop_manual.pdfIn PDF document text
    • http://tosefiwaniw.rf.gd/motu_patlu_ki_jodi_free_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/kusurisosasibed.pdfIn PDF document text
    • http://dekifovep.epizy.com/english_aptitude_test_for_tcs_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/utorrent_mac_10._9._5.pdfIn PDF document text
    • http://boripodadup.epizy.com/slack_for_ubuntu.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/91068181197.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/axis_mutual_fund_fact_sheet_march_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/pdf_accessibility_checker_pac.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_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 4928 bytes
SHA-256: 73428b721c2a7ecebb99c6626d83b6ec3fb1f0c55265536d7b1cef778d5c1a94
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 10620 bytes
SHA-256: d77b8cf7b758945310c08593ca00012af6a35ad972e215013f5a667d692b2f74
font_02_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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