Malicious PDF — malware analysis report

Static analysis result for SHA-256 817a76a1d20ba8a1…

MALICIOUS

PDF

73.3 KB Created: 2021-01-26 13:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 14e0a3d346aaa42f17df70f122516fb2 SHA-1: f3a92130ba3c43eeae54bb27ae2b12bfae82ae0d SHA-256: 817a76a1d20ba8a14046f10e906f989ba850f3965491cc1c1bbb4e6e34ed56e1
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'frog life cycle worksheets', directing users to potentially malicious URLs.

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 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://druttle.ru/aws?utm_term=frog+life+cycle+free+printable+worksheets PDF link annotation
    • https://ginijamuda.weebly.com/uploads/1/3/1/4/131409148/doxuti_zudularupalili_kirixumatap_jasabedofewinox.pdfIn PDF document text
    • https://cdn.sqhk.co/nedovipirumu/gjhdDpD/3883828197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5ff27515d8c1e.pdfIn PDF document text
    • https://zoxobafibo.weebly.com/uploads/1/3/4/2/134235835/9621634.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/cvJ5sFZ/rokelidawixebojalijubixiw.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/7Ik5Jk8/gunesufawi.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/3745162.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421474/normal_6004a88699e73.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/idXgdnX/laxibavagupojo.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/bIojjeN/goat_sim_payday_all_trophy_locations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_5feaf7c1b12dc.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/jj1LCjf/ps4_remote_play_controller_support.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/cia4Zje/east_coast_radio_top_40_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/tropical_fish_guide_hawaii.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/interview_questions_and_answers_for_nurse_managers.pdfIn PDF document text
    • http://midotujeg.rf.gd/91958859052.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/64595905586.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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 5628 bytes
SHA-256: c153f1b989106e4c67d58380264324a5d4ebd5753d137c2b4528767600ef859e
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 10792 bytes
SHA-256: 57bb9b3fc1141451ea6e351eea6e5e18673f70e03668c22c45f190bbbe04a2bd

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