Malicious PDF — malware analysis report

Static analysis result for SHA-256 453384f79a1502b7…

MALICIOUS

PDF

73.8 KB Created: 2021-05-12 00:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c62d13c26618cc701172659a70c2e31 SHA-1: 71ea47207e385ffe56a066080f0dc3e9f7199979 SHA-256: 453384f79a1502b7bb0e0edf473923a010272714c00eb08b9b0390f254605281
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=how+to+put+shulkers+in+shulkers PDF link annotation
    • http://stassikorskyi.com/alcoholic_punch_recipesw8szm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_602abbaa9621b.pdfIn PDF document text
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/sanetoviratuwalijor.pdfIn PDF document text
    • http://fimunukowira.iblogger.org/contrato_prenupcial_modelo.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/1894230.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/Feijshf/survival_simulator_sulfur_ore.pdfIn PDF document text
    • https://cdn.sqhk.co/gajeneset/4Cjc6NP/rnb_music_download_free.pdfIn PDF document text
    • http://reretola.iblogger.org/52241661358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5fd2a9c81ea47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386336/normal_5fcd0fb72d545.pdfIn PDF document text
    • http://nopejinon.iblogger.org/app_locker_apk_iphone.pdfIn PDF document text
    • http://duplicwcnj.space/amharic_bible_niv7dii3.pdfIn PDF document text
    • http://slmit.space/bundle_id_for_android_appsgjmj5.pdfIn PDF document text
    • http://kayikciakademi.com/36791723244aqx5s.pdfIn PDF document text
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/biwuwowuduvugagizop.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/gCnhbhg/ringtone_download_music_sound.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_6020ffe808693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_603dc34cd5282.pdfIn PDF document text
    • http://meetsoda.pro/coleman_lantern_mantles_radioactiveatlim.pdfIn PDF document text
    • https://cdn.sqhk.co/marezotije/aOPjghh/8551168634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_d0e655fce1744d04995d40cf93c94268.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_1fb82d1775b546f68f4069c9aa627642.pdf?index=trueIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_794f920705d94c2ead89082264a99e1d.pdf?index=trueIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_669df7a7a54e4788ade814e84a93a3a7.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_a3d371bd9a77430d89e6fd5cf28e6887.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_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 4812 bytes
SHA-256: 8f0032bd960b924b45f0f089d8c96d7f18ed8cf4d2c6b3d5d8aaffbe7bf1a59d
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 11024 bytes
SHA-256: 68b47d6b2bd5ecb3260e6eb57f6c901434c44d4de8d3d2494f1548d51847c287