Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c5ea62b8ef27c3…

MALICIOUS

PDF

91.5 KB Created: 2021-05-17 06:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eccaa5d6f25ff10f0e40994bcb60018e SHA-1: 6374c17413b95d9c89221adde60cb0e8ba97c48b SHA-256: e3c5ea62b8ef27c3cdff0d39c341e80e1cff44fb820d967fda4db29a03f9c6fe
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 links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though partially corrupted, contains metadata related to PDF generation, indicating it was likely programmatically created to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=amelie+comptine+d%2527un+autre+%25C3%25A9t%25C3%25A9+piano+chords
    • http://cooldomen.space/laxatozebilesefazomegav26vi1.pdf
    • http://tadurarawi.mypressonline.com/where_is_minnesota_renaissance_festival.pdf
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/8292449.pdf
    • http://fujiforu.22web.org/convert_word_to_ppt_small.pdf
    • http://xoxuvajes.mywebcommunity.org/30477858579.pdf
    • http://swast-group.website/52488364532dnuo8.pdf
    • https://fomodefoz.weebly.com/uploads/1/3/5/9/135958111/ripujigemebe.pdf
    • http://allieshouseofhope.com/how_to_calculate_dividends_on_preferred_stockol3kd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fixadamobus.epizy.com/3071921271.pdf
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_450de876b6c24e90aa6bf8fda131708d.pdf?index=true
    • http://marurutefa.atwebpages.com/western_comics.pdf
    • https://uploads.strikinglycdn.com/files/c89e28e9-9af8-4693-b2de-3e75cd850d5f/how_music_got_free_audiobook.pdf
    • http://nuzabasere.rf.gd/bhola_nath_photo_hd.pdf
    • https://uploads.strikinglycdn.com/files/8dbb0a5b-5d4c-4c31-b289-625d42046af1/basketball_inbound_plays_for_youth.pdf
    • http://muduwabu.rf.gd/fiction_sumika_piano_sheet_music.pdf
    • https://ea29520f-fefa-4c12-ab21-0e0839e82572.filesusr.com/ugd/5d2047_85a81d5baa1b48f5911383148e7e5217.pdf?index=true
    • http://jinibodakix.epizy.com/william_tell_overture_finale_sheet_music.pdf
    • http://muwuvago.atwebpages.com/guwan.pdf
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_46ac0509c7d749e981051e523f06cf5e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000dec1.bin
d9c65615bdfadd55993d0dfc286019791a6abeb2da62bd9b1cbc22c211629cf5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDEC1 22640 bytes
font_01_sfnt_off00012546.bin
98e04346df7802724acb5fc04730c88343ee2fc9b44f4f9e7c15ffa4ffb32727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 5476 bytes
font_02_sfnt_off00013778.bin
67f84f74e1e1dc155b807ad0f433db2246f03df95236aa0de08367dac4b14963		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 11188 bytes

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