Malicious PDF — malware analysis report

Static analysis result for SHA-256 b787b73383498f1a…

MALICIOUS

PDF

70.3 KB Created: 2021-02-24 11:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 03d93f5593993c01026bcaa4510c236e SHA-1: 56e0be8983e36be657dde889bd49c94f664c8144 SHA-256: b787b73383498f1a7e81ffb75e071f60038d20ba6bf1aae7e7eabd3cbc8dff54
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains a significant number of embedded links, many of which point to potentially malicious redirectors or link farms. The document body, though partially corrupted, suggests a lure related to writing a food safety culture plan, which is likely a pretext to drive traffic to these external sites. The presence of numerous external links, including one identified as a known malicious redirector, indicates an attempt to lead users to harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=how+to+write+a+food+safety+culture+plan In PDF document text
    • https://vaxuzumop.weebly.com/uploads/1/3/4/8/134870956/8937884.pdfIn PDF document text
    • https://cdn.sqhk.co/lerutefo/PjehffU/xamofetuturenumev.pdfIn PDF document text
    • https://cdn.sqhk.co/mapigusene/UZ73hff/36620843885.pdfIn PDF document text
    • http://alphabitx.com/zofilitilabuduf3hf6o.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/Gpgfjb0/70434702647.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/Vibcajb/old_man_s_journey_apk_mod.pdfIn PDF document text
    • http://leftoutclub.com/tosesikucv3.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/jaBNgeL/space_runaway_ideon_be_invoked.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/weretulu-tavabiriso-kedinivageb-nufabekupa.pdfIn PDF document text
    • http://sewonmedix.ru/acceptable_use_policy_template_2019zfsbv.pdfIn PDF document text
    • http://mon-cmbretagne.com/53985697634dbu1i.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/belopudevuzuza/latest_version_of_whatsapp_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/zakutukowuwexobonaxewut.pdfIn PDF document text
    • http://damusoborubumo.epizy.com/kewulavofu.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/dryer_sheets_safe_for_baby.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/arduino_due_audio_library.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_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 5304 bytes
SHA-256: c093464b9c2285f78634bc423fb6efc1a1d20b8834c09efe7acbaea4d14a2720
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 11260 bytes
SHA-256: d541bfa7db03bdfe06c9d1965e6d1b86ef73ca474f2c8a051c15d5fca1a856ff

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