Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5738ee53ec3c97d…

MALICIOUS

PDF

75.4 KB Created: 2021-04-24 00:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 39646f8772a7fc33b2e8e518cfeee41c SHA-1: 7ae451522495be0a037dc60040c8deb00fa469f6 SHA-256: b5738ee53ec3c97da6ddf59e41b03ed735c6b93c679daaa34a899dc004367a25
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, a common tactic for SEO link farms and phishing. One prominent URL, 'https://yafferge.ru/strik?utm_term=what+to+do+if+your+heater+won%2527t+turn+on', is flagged as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to heater repair, likely intended to trick users into visiting the malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=what+to+do+if+your+heater+won%2527t+turn+on In PDF document text
    • http://glossywp.online/77069018436fz3xd.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/assumptions_of_economics.pdfIn PDF document text
    • http://arevakar-travel.com/wabopamiwunojelasozcg7.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://kusukeluwabe.mywebcommunity.org/beehive_class_9_full_book.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/rewepalazamiso/citizen_eco_drive_ladies_watch_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/359107170.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/xutovuvutamurotefolazudap.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_35238d971bb245c59d3772b083575f0e.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_b37010b4fb9d4151a656a0e1551005b4.pdf?index=trueIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/la_profecia_celestina_libro_gratis.pdfIn PDF document text
    • https://4228e3e8-6e56-436b-9c2a-5710a6c3a216.filesusr.com/ugd/e32dc8_6e974efb2af64e538e3946965ebfdc06.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/jirorora.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/birding_trip_reports_western_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/kesazuzubigewebi.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_75f43c6bad934d05a3ea63802dbc0a26.pdf?index=trueIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_20d1d6d2b1fe4ef5be847ce6479852cc.pdf?index=trueIn 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_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 5028 bytes
SHA-256: d0d3d67a8401b333b1493922439b9a83959b02d37fa9a19031a73a91c8218160
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 10664 bytes
SHA-256: 56f8011907912453808f8909cc9dc5834dd1dd9c41316c6f0f91051d403cb5cb

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