Malicious PDF — malware analysis report

Static analysis result for SHA-256 68da1690bc31d285…

MALICIOUS

PDF

83.4 KB Created: 2021-02-24 11:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e11a4c398bf689e84c59c3b9843ed481 SHA-1: 2b801f780c7649e80a37e58dfdddb2dbf9af7f53 SHA-256: 68da1690bc31d285e956d8367a1607fd34851322f350b289407d736ac80a8710
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with several heuristics flagging it as a link farm on disposable hosting. The document body, though heavily obfuscated, contains references to 'Spider swarm 5e' and application metadata, suggesting a lure or exploit attempt. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

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://jottigo.ru/wix?keyword=spider+swarm+5e PDF link annotation
    • http://ritual-venki.online/funny_easy_riddles_with_answerscjimp.pdfIn PDF document text
    • http://kuxalowakanuxed.iblogger.org/87164621442.pdfIn PDF document text
    • http://teachersaid.fun/youtube_mp3_conv2rtqt1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_6022853b9aa14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_60339e512343d.pdfIn PDF document text
    • http://mirror-x.org/98387995158vid6i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_5fd1c33ed8c7b.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/988186383589wont.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5ffa24f97ba7a.pdfIn PDF document text
    • http://repair-kompov.ru/68964636406lp3f5.pdfIn PDF document text
    • http://nudistoff.club/what_are_the_different_types_of_decorating2cxvw.pdfIn PDF document text
    • http://janurikemodowu.iblogger.org/maladie_de_l_appareil_gnital_fminin.pdfIn PDF document text
    • http://greyfruit.space/62348649678td8s5.pdfIn PDF document text
    • http://wuzagabi.22web.org/introduction_to_computer_security_matt_bishop_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490754/normal_60206105a63d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosolebaxuwutux.rf.gd/nojojitat.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_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 5392 bytes
SHA-256: 51032795ef2bf9dd2e7ce24eec38e47d7e38166bd2fb4938b7b5fd619f862b32
font_01_sfnt_off00011d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 10420 bytes
SHA-256: 1533432d4855eff13aedaee2e32d9bbb28e1c413dd9f2d4aaa85c9c5addf4f08

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