Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec52f66d7910631…

MALICIOUS

PDF

77.5 KB Created: 2021-06-06 02:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 18b7ba891892753c9465acd1356a2afc SHA-1: f9abc9045fc962ef949c7683fe01108d705cca54 SHA-256: bec52f66d79106310708b2062e958c9471ac48e7016c1e5eda20073de8c38b71
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to disposable hosting services, and one prominent URL that appears to be a redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure malicious links within a large number of seemingly benign ones. The primary malicious URL identified is https://wastran.ru/pbw.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/pbw?utm_term=inductive+and+deductive+method+in+economics+slideshare PDF link annotation
    • https://farunigi.weebly.com/uploads/1/3/4/7/134716297/zekeja.pdfIn PDF document text
    • https://fibexijenoka.weebly.com/uploads/1/3/2/6/132680926/7fa60d9e686b7.pdfIn PDF document text
    • https://woxogobigevi.weebly.com/uploads/1/3/0/8/130814596/43f280a5a1bd6.pdfIn PDF document text
    • https://fawukudaboguris.weebly.com/uploads/1/3/4/3/134353338/8cb00bb.pdfIn PDF document text
    • https://xolasugoduto.weebly.com/uploads/1/3/4/5/134592704/883f751f4cd3812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_601518667d0ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428061/normal_5ffa793fb75e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371003/normal_5ff8016d08f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_6013623d2b41b.pdfIn PDF document text
    • https://mifozerezol.weebly.com/uploads/1/3/1/6/131637459/8336a54a16.pdfIn PDF document text
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/dopadanasafepunize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144686124/what_is_the_order_of_the_adjectives.pdfIn PDF document text
    • http://mifudatu.pbworks.com/w/file/fetch/144689694/arabalar_imek_hz_hile_apk.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144451389/sample_virtual_assistant_resume_in_canvas.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144692409/el_prncipe_de_las_mareas_pelicula_completa_en_espaol_latino.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/w/file/fetch/144553215/ncert_class_10_maths_book_tiwari_academy.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/vopuwuxubivafirupuje.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144454236/wujodulez.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144450492/71758144382.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/f/how_to_check_if_you_have_a_warrant_in_arkansas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8640aff6-3569-40d2-add1-f3e766bb6307/is_black_and_decker_a_good_coffee_maker.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/144677970/cant_sign_into_aol_on_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba340eaa-592a-4ba3-b58a-d54f02f9dea2/tekusabefevusajobo.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_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 5176 bytes
SHA-256: ca20ac0a899b47a1546ce563c82bada0eb45d3124eac7d98e406827137e90637
font_01_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 10908 bytes
SHA-256: 3bd878c6c9561abeda23bcee5b26a7db3e506fd60ea3630c4b28c6b4de386e90