Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fd6abe70bc9177…

MALICIOUS

PDF

87.3 KB Created: 2021-04-22 11:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 36a551cc04acccaa900ab8b16b77fe92 SHA-1: b5b08e73a2802171ff966d8953e53014742039f3 SHA-256: e6fd6abe70bc9177562d6aba323ca5dbccc3ccdafb6dfda403f0d5b91a7de647
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to changing a battery in a firex carbon monoxide alarm, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=how+to+change+battery+in+firex+carbon+monoxide+alarm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470402/normal_5fe73a5c42e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5fd9b99c9f0fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478148/normal_6003ae413d9a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405443/normal_5fe02f93526ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_60366c49ba715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479451/normal_6037b3fe4da86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465941/normal_604048b4ef40d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lifobem.myartsonline.com/dayton_gas_unit_heater_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a5c0c1-0558-4802-9069-3e6bab761c1c/how_to_use_humminbird_helix_5_si_gps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be5153d-b149-40d6-8255-0d98050084fe/acer_chromebook_15_cb3-532-c47c_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fe92f9-0bcb-41cd-bb17-66aa31e2bb9c/11091591140.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/equidad_social_definicion.pdfIn PDF document text
    • https://29fa80ab-3b21-46a5-a5c9-66d7a3d84e9c.filesusr.com/ugd/eb9fb8_edce37cd5a934bdab75901551fe8c2f7.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_b9aae179a53943a8a967b609f0864519.pdf?index=trueIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_6637b284b1524b9bbb3b521800214eb5.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_a57f692903e245aeb447aa1c68acf5bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9dd4972-45f7-49bb-ba53-f78cab9c8ea1/35791104482.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/24206904723.pdfIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_3c8a6c44b15e494cb7c5a83cb9469083.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/phb_5e_wizard.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/voltaire_candide_ou_loptimisme.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/wesexota.pdfIn PDF document text
    • http://sijadogif.atwebpages.com/58593967880.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 3744 bytes
SHA-256: 04a25f791fce446c10cbca14cb9dc3a6ed1ddf8ac464b0f315047666a771db09
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 5620 bytes
SHA-256: e320b635ba3aca09ddf5036744520a5a15efc1bb924748b1a55be2509d525715
font_02_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 10524 bytes
SHA-256: 3e5de5f37c865f911363008258fbaea21b56b0ce74cb073aee3ee6ca6d32a9f5
font_03_sfnt_off00013592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13592 16708 bytes
SHA-256: ae071d662603c6916985887f65eb3a0d8f2afc7cc13228f83f812eb11570e47e

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