Malicious PDF — malware analysis report

Static analysis result for SHA-256 b635429b11d88bbc…

MALICIOUS

PDF

91.8 KB Created: 2021-04-05 13:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 587f00b7a157c867cff7a1dfb3c5ca4c SHA-1: 14c5d3abdd3714c21b75926574bc489ba3e7e054 SHA-256: b635429b11d88bbc695ed46d3239f03282bbd8899966abf245ff55881688efe0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=types+of+diabetes+mellitus+pdf+2017 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5ff611581001b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427287/normal_5fe2358e5eafc.pdfIn PDF document text
    • https://bodovusinorone.weebly.com/uploads/1/3/5/3/135347185/kufuwilikopejekoke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488315/normal_5fc91c5121130.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_5ff3e635b0a2f.pdfIn PDF document text
    • https://rexenupe.weebly.com/uploads/1/3/5/2/135299979/kibikagujifosorema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_6047fd5284c56.pdfIn PDF document text
    • https://tojawejememu.weebly.com/uploads/1/3/2/6/132682640/benejaxexesijitugif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_6069967a7dcc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_6068270822474.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/gapovotiwifefam-nunopilanovuw-lefogixuwezaz.pdfIn PDF document text
    • http://titodisoke.22web.org/58911319445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452173/normal_5feec43ef1dae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450044/normal_5ffa1631f3d2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajidot.epizy.com/starbucks_almond_milk_frappuccino_nutrition_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/impressionism_and_expressionism_art.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/32297362833.pdfIn PDF document text
    • http://sujonereduvuk.rf.gd/watuberuru.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/bella_ciao_guitar_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/muxepifunele.pdfIn PDF document text
    • http://zivunoked.epizy.com/23018424181.pdfIn PDF document text
    • http://furosusuz.epizy.com/avast_antivirus_gratuit_pour_android_2018_apk.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_off000128df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DF 5688 bytes
SHA-256: e2686b2f7ce0665e1e5a908c7a7a651e3c51f3d00c71710bb6eea9b1b831ba30
font_01_sfnt_off00013c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3A 11024 bytes
SHA-256: a227e2150cac3dbb0e42cb7407a0d94f21bb3572b4c3aeebb9cfc9ca06cd9fa8

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