Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d43d6f1fb1a9de…

MALICIOUS

PDF

73.9 KB Created: 2021-02-24 20:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d4f2298ac8ad23e5c094cd9550ee4d1c SHA-1: f5856240d3c5a3d44345b8de8093bb2ff4128ece SHA-256: f0d43d6f1fb1a9de5a10dbc9bc95e272c49693c2ebca5a519966d37462274c5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/wix?keyword=call+of+mini+zombies+mod+apk+android+1 PDF link annotation
    • https://cdn.sqhk.co/gituridewo/Fxvgchb/zitobamilivijen.pdfIn PDF document text
    • http://fuxukibegub.iblogger.org/15601373725.pdfIn PDF document text
    • http://bachanalytics.com/24168752673aj4aa.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/89343330567.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/j2gc1id/54087897342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopolug.myartsonline.com/fabuduwabuzokefokokanarag.pdfIn PDF document text
    • http://fukibas.epizy.com/sumaporenusolabadob.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/77603131562.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/finding_dory_movie_dual_audio.pdfIn PDF document text
    • http://femodizabofowu.epizy.com/dufaz.pdfIn PDF document text
    • http://lejopuluke.rf.gd/grade_2_comprehension_worksheets.pdfIn PDF document text
    • http://kalesas.rf.gd/string._format_or_stringbuilder.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/upper_back_pain_exercises_with_pictures.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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 5396 bytes
SHA-256: 660d99f37ddd76e2b5bb0a1967c3d9f637847c41c28fca564b09698eb63df605
font_01_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 10580 bytes
SHA-256: 454c8cdcbaccc663fced46c9958fda06e7540e707aa0cb088dd258d7174685c1

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