Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1dafd5ffad2e539…

MALICIOUS

PDF

75.7 KB Created: 2021-04-07 00:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 96f928311c8c7b8a291ce39391c824e2 SHA-1: f659727786e0e9648ecce3dc6480d8624728941e SHA-256: a1dafd5ffad2e539da77e95a1982738cf7812cde9c0e4f9c2b0ddbb6e72418ae
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of multiple links on disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware delivery site.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=what+is+concept+mapping+research+method In PDF document text
    • https://cdn.sqhk.co/mirusopujame/TQgfuif/solar_siege_mod_apk.pdfIn PDF document text
    • http://lemafesopeposuz.mywebcommunity.org/baroque_music_characteristics.pdfIn PDF document text
    • http://palupalukagu.mygamesonline.org/house_of_gold_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/fakujodi/viggjhf/punerofoferudu.pdfIn PDF document text
    • https://cdn.sqhk.co/tavimuxeju/fidKSia/72333677820.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/f7Jiegc/memameweboxiv.pdfIn PDF document text
    • http://joxutikomujawi.iblogger.org/tibudome.pdfIn PDF document text
    • https://cdn.sqhk.co/volakase/Z2hfiam/ziwikewosux.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/78382463500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc83e94-9169-45ed-abd7-4e135c6c9b04/80843928606.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/mufanetunusupiwekenogoz.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/william_blake_the_tyger_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/html5_canvas_game_performance.pdfIn PDF document text
    • http://figekokiba.rf.gd/facebook_messenger_link_for_android.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/dyson_dc39_head_not_spinning.pdfIn PDF document text
    • http://vutevesofu.rf.gd/menuvasateneg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f270f8-8999-46ce-b490-4855f940fb72/weka_tutorial_exercises_answers.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/79126722728.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_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 5468 bytes
SHA-256: d16a9ac0231064fb488cc2d05dbc20838c9f4c841f641956a9052a8da8556d51
font_01_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 10564 bytes
SHA-256: aa78d82c855c1139a2b0df707f180f886cab54b0b9f6204c8543f57464f8a64c

Open this report in the interactive analyzer, or submit your own file for analysis.