Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4eea7645dd9e5c7…

MALICIOUS

PDF

81.7 KB Created: 2021-04-12 01:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 008e306b9aebf9ff33c8d55aff75a923 SHA-1: 664029c495023578cb8d2fda59c553b906adb236 SHA-256: e4eea7645dd9e5c76466e7f99d9ed5e173cb8111b1cd11fc4c40e3d041535722
206 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a malicious phishing document and hosts a large number of external links, many on disposable domains. The document body, though malformed, suggests a lure related to 'cleaning filters on dehumidifiers' to direct users to these malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://lozipotod.ru/strik?utm_term=how+to+clean+filter+on+dehumidifier PDF link annotation
    • http://dukepiweg.iblogger.org/wonderstruck_guided_reading_level.pdfIn PDF document text
    • https://cdn.sqhk.co/vilosezuj/hgigija/manor_cafe_hack_version_download.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/jcgjgiY/nuance_dragon_medical_templates.pdfIn PDF document text
    • https://roneresikixa.weebly.com/uploads/1/3/4/4/134476702/dapunugozamaf-robuvazik-jawisajawibasum.pdfIn PDF document text
    • http://inscarusa.info/83848007283vitb3.pdfIn PDF document text
    • http://winsl.space/confirmation_of_payment_email_templatei6tfo.pdfIn PDF document text
    • https://lanekuloriko.weebly.com/uploads/1/3/0/8/130874063/0ec76208029ce.pdfIn PDF document text
    • http://zanedasimitavo.22web.org/botigotanebopegowabup.pdfIn PDF document text
    • https://cdn.sqhk.co/bujugasefoli/eht0w0c/45782278718.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/jcie4Fe/world_war_brothers_ww2_nisanc_oyunu_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugamaxu.rf.gd/jogasezofapepadimiduza.pdfIn PDF document text
    • http://difavokagakaruw.epizy.com/gitaxidedosojabozo.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/punumobalupifu.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/pibarab.pdfIn PDF document text
    • http://lopumupukerodu.epizy.com/spore_forming_bacteria_are_capable_of.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_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 5136 bytes
SHA-256: ffc54ea486582e978e3264b580ce7af06f6e570a1504b24971feb445c1d94092
font_01_sfnt_off000115b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 10536 bytes
SHA-256: fc918d4b96ea285e61dc172ee72f414330056f48d00099659dd8d5fc61db450d

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