Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc4ef381a9bbf92…

MALICIOUS

PDF

82.1 KB Created: 2021-03-02 07:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 02af0583fb08613351f68422d74072e8 SHA-1: 34de1f0a5653589890844c0df217d2f465bc6cfb SHA-256: 5bc4ef381a9bbf92670586741f2c5391bd657e173259ddd701a8cee018c775b1
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though partially corrupted, contains a search query related to USPS stamp prices, likely intended to attract unsuspecting users. The presence of ClamAV and ML heuristic firings confirms its malicious nature, likely as a phishing or malware distribution vector.

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
  • 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.
  • 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://vilenefex.ru/aws?utm_term=what+is+the+current+price+of+a+usps+stamp PDF link annotation
    • http://bosemefawixuwov.mypressonline.com/vumevugis.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/jejeigi/64184750910.pdfIn PDF document text
    • https://jagojepenita.weebly.com/uploads/1/3/0/7/130739472/c121dcc1b3a8d3.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/honda_civic_transmission_fluid_change_interval.pdfIn PDF document text
    • https://lomewulepizava.weebly.com/uploads/1/3/3/9/133999744/doruf.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/pmge5if/3047436906.pdfIn PDF document text
    • https://cdn.sqhk.co/pefapalotux/ibYwujj/48138587013.pdfIn PDF document text
    • http://nesobaka9.xyz/aanewale_kal_video_songz2kn7.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/jgjfgcy/flight_simulator_games_download_for_pc.pdfIn PDF document text
    • http://sks-expertiza.ru/dragon_warrior_2_cave_to_rhone_mapf8xub.pdfIn PDF document text
    • http://card2card-perevod24.site/15504374683vikue.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/bomifabipi/59552446989.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/rufuri.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/jewajon.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/cash_register_reconciliation_sheet.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_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 5236 bytes
SHA-256: b2facf16193e93f3496f92017064bb2fa47173959872a2c0cd4b9fcc55885d46
font_01_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 11236 bytes
SHA-256: 7fbb91f0e7ea841e8ee6baf9ef1151ed6d47e6a8c238f766b2925533f69208d8

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