Malicious PDF — malware analysis report

Static analysis result for SHA-256 437fa6aa4de06533…

MALICIOUS

PDF

77.4 KB Created: 2021-03-08 06:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c3bf4677f2322c1377c90c417a88f7f4 SHA-1: 4acc9328fe52762b6a148e7a5429541c679fce2c SHA-256: 437fa6aa4de065335d1fda86d85a3ecc3311172d2928486b92e6f598eaf3af71
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged for credential phishing. It contains multiple external URIs, including one that redirects to a Weebly-hosted PDF, likely serving as a lure for Gmail credential phishing. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/vopine.pdf.
  • 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://zajinet.ru/aws?utm_term=experimental+probability+worksheet+pdf+answers PDF link annotation
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/vopine.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/ibjaX0F/kotawedibedejeku.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/hb1NLge/70120731459.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/dGsVgio/25366425243.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/2435326.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/hahiLid/tuxezuda.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
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_9c8eea2f15394fe0b11556afc11353b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a9d5ef-d2f6-40fc-b603-59877bbd45a4/tomimumujexu.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/calibre_2._1_teu_sabor.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/y_intercept_form_to_point_slope_form.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_d2a71c5601a84c47a91165ab82ac12d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b88111-e1c1-45e0-a033-2563d70f17d4/what_should_i_paint_for_my_boyfriend.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/tipos_de_archivos_de_audio_ventajas.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/how_to_add_options_trading_to_td_ameritrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70cfd09-afd6-433f-b705-5a764e52bb2b/fotitekokuxadogulofo.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/70698485359.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_2649ab92169c453589c787e941a18c7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0958545b-8e76-4d22-b451-3dd396ea3f52/kinetico_water_softener_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/tenant_agreement_letter_format.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_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 5492 bytes
SHA-256: 06d52df2a4b22bb2ec959331234bbfc79b275afa2e0c0fa8569e0083709e805b
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 10636 bytes
SHA-256: 298069d5a2b01b1fdf0b36e99a16b3230a1de130f91895a71a66f4105575981b
font_02_sfnt_off00011988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176