Malicious PDF — malware analysis report

Static analysis result for SHA-256 43387d13f1811ecf…

MALICIOUS

PDF

78.4 KB Created: 2021-02-24 17:36:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7c2e5d1fb2e5d057f9a0cf9a04feb0a4 SHA-1: 78c61715913aec256df99e4d4f06d046fd070fc2 SHA-256: 43387d13f1811ecf57c4c5373af9c608da415cbe4107294e06bf16c032430d14
184 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one prominent link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to thermostat reset, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/award?keyword=how+to+reset+honeywell+thermostat+th8321r1001 In PDF document text
    • https://wobanavemo.weebly.com/uploads/1/3/4/0/134096337/d1dd0c92635e48.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/3453495.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/fipivo.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/d41fa0.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/sawodigifokosa.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/legidisedipipen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://faxiruvud.myartsonline.com/fufibajimomodo.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/moxuziki.pdfIn PDF document text
    • http://kizosit.rf.gd/bloody_keyboard_manual.pdfIn PDF document text
    • http://livirava.atwebpages.com/69124661364.pdfIn PDF document text
    • http://roxonotagake.rf.gd/bundeslnder_karte.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/22976427574.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/feboximegunejanajixu.pdfIn PDF document text
    • http://gidigeja.rf.gd/1000_action_words.pdfIn PDF document text
    • http://goduziposu.rf.gd/pibepatel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 5504 bytes
SHA-256: 8ce91527414344929308ac9ca42c93a35aca79a8ac36ed6f8864562cc1d41945
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 10520 bytes
SHA-256: aa463d42ba22fe77d46aad3e2eb14b6a339cea612f3c88b9db12d06ff86c023e
font_02_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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