Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d223f7c8a611d96…

MALICIOUS

PDF

111.1 KB Created: 2021-03-17 01:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 70a43b73dc95768cd0d37bfe264ddf04 SHA-1: 7e0594689dbd1da628ebc1259fc437418515361f SHA-256: 7d223f7c8a611d961c04bbad93943dedbfbced71943acc42f5f657b2a51a52ef
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF document flagged by multiple heuristics as malicious, including brand-impersonation credential phishing. It contains numerous external URIs, with one specifically pointing to a redirector associated with a Bank of America phishing lure. The document body is heavily obfuscated, but the presence of external links and the phishing heuristic strongly suggest a credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zozolunefa.weebly.com/uploads/1/3/5/3/135325744/2168868.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://seumenha.ru/award?keyword=bank+risk+management+framework+pdf PDF link annotation
    • http://info-pages.ru/2012_jeep_grand_cherokee_limited_horsepowerpx9kd.pdfIn PDF document text
    • http://pressit.space/clapton_coil_ohm_guideoyqsy.pdfIn PDF document text
    • http://detonic-buy.website/lonagoduligizamutr964.pdfIn PDF document text
    • http://azakalaza5.xyz/jubagunedafogezal90mt9.pdfIn PDF document text
    • https://zozolunefa.weebly.com/uploads/1/3/5/3/135325744/2168868.pdfIn PDF document text
    • http://moneyindia.site/7401780362u7yww.pdfIn PDF document text
    • https://fezapatinegu.weebly.com/uploads/1/3/4/2/134266508/8fbda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6929b5f-0b04-44f8-ba0b-1cb252b5bc84/an_actor_prepares_movie_soundtrack.pdfIn PDF document text
    • http://wezikadedikenev.epizy.com/mebewavolikajumon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71dcd699-cecb-437d-bc45-acefe1cb50b9/xupevukosolane.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_054078a1d17b4d31ad58be6b7723a801.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_5407b381dba64653b1987e3f20f2b66c.pdf?index=trueIn PDF document text
    • http://midelex.epizy.com/wonowetufuguzenofapejuma.pdfIn PDF document text
    • http://mudikavorutemu.epizy.com/alter_ego_a2_corriges.pdfIn PDF document text
    • https://39dd5e1d-a581-41ec-a80f-9e19245c660f.filesusr.com/ugd/c2656d_47c8eead8ff340139ae2bc2550291a3b.pdf?index=trueIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_f0a3374b22d642808b201bbbe612213c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/743e00ca-837c-4300-a324-f04efbb2efd2/guzoteput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe62d02-4bb7-4b5d-b0e5-88157626e698/how_to_use_ninja_juicer.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/zavibopupetovor.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/agitated_state_informal_crossword_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/15498495627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8862ccc-60e1-46df-9899-0522f14e1914/52828087530.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_off00017456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17456 5536 bytes
SHA-256: b87cca0a97f3c116145b8be933ec508ce390ad88e71bfc6b867eb5b0a102e562
font_01_sfnt_off00018731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18731 11664 bytes
SHA-256: 19d69a4744646cca731442bbb57bee1514218ded16176a7cdbfd406b0c3fafea