Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c0573eea91c07a…

MALICIOUS

PDF

75.0 KB Created: 2021-01-22 22:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9a55ae8f5ff87e82d0d4be98e1be0196 SHA-1: ff328b202939851a6c2f7f81ee521e7854dcd738 SHA-256: 80c0573eea91c07abb153fbf8faa06742e26a2ee779d3341127354fddd1a7a43
134 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, some pointing to disposable hosting and utilizing UTM parameters, suggests a phishing or credential harvesting campaign. The 'Urgency / deadline lure' heuristic further supports this, indicating the document attempts to prompt immediate user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/aws?utm_term=medidas+cautelares+cpp+pdf PDF link annotation
    • https://cdn.sqhk.co/vovewotutal/hdGjc0Q/zuzadutelizogero.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/jehaWjd/wavijire.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/90khhhd/crossing_over_definition_simple.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/90462597208.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/iifigid/2_player_pacman_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/hfhhghP/teddi_mellencamp_age_net_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/iziDhiv/gagonusemorefuwuvaloz.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/jeJMpTz/bubble_tea_flavors_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/aCjd8gi/monster_craft_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzexexaniledow.epizy.com/widujomun.pdfIn PDF document text
    • http://gowegonuma.epizy.com/the_breeze_cotton_candy_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/office_365_smtp_authentication_report.pdfIn PDF document text
    • http://zutulig.epizy.com/the_avengers_mobile_game_full_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/brampton_manor_sixth_form_college.pdfIn PDF document text
    • http://segoxegigo.epizy.com/xaxifoxetukafexu.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/out_of_office_auto_reply_template.pdfIn PDF document text
    • http://siwodonodefofo.epizy.com/fujegef.pdfIn PDF document text
    • http://piwefijegiv.epizy.com/berijobarubagumekozavuga.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/dowuzozatexibubuve.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_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 5156 bytes
SHA-256: 1afddcf80545ecb759c8a200d246994ad5502467052627bc106af543545d10d3
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 10864 bytes
SHA-256: 4ad2e8255611fc62c1dafca2518638b32e9d3f1a709ddb4c8bb65fe616cc9b96

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