Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8736e257d31b59…

MALICIOUS

PDF

78.0 KB Created: 2021-05-24 05:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 16ace95f4b301c24093e07bf0236c3c0 SHA-1: c1070917e39217eb3b7d2a619e82a1eb73387b1b SHA-256: af8736e257d31b597d399b2a29d71096e800c4f3e3cf711e2fe9948f09709cf2
256 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple heuristics indicating it is a phishing lure, specifically impersonating UPS. It includes a link to a redirector URL, 'https://kuzutuzo.ru/strik?utm_term=verify+identity+unemployment+michigan', which is likely used to host the phishing page or deliver a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • 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://bijararavi.weebly.com/uploads/1/3/4/5/134587429/zumagukegixisi.pdf.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://kuzutuzo.ru/strik?utm_term=verify+identity+unemployment+michigan PDF link annotation
    • https://bijararavi.weebly.com/uploads/1/3/4/5/134587429/zumagukegixisi.pdfIn PDF document text
    • https://kusufefa.weebly.com/uploads/1/3/4/4/134471409/sukirosoxigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_604ad19723e66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_606e27efc39d0.pdfIn PDF document text
    • https://bogagabav.weebly.com/uploads/1/3/5/3/135305267/pefevu.pdfIn PDF document text
    • https://vurigejowuzebad.weebly.com/uploads/1/3/3/9/133997249/zasuno_puxonuvoz.pdfIn PDF document text
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/xaputoga.pdfIn PDF document text
    • https://miwozowupib.weebly.com/uploads/1/3/2/6/132681947/7cdedfc38c3e9b.pdfIn PDF document text
    • https://rabizelen.weebly.com/uploads/1/3/1/4/131453176/tobukumaxuvom.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/384ea10d-e9cb-4cd8-b66f-426092f34669/behavior_intervention_plan_autism_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/apa_reference_page_format_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/60584267394.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/vuxaresinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac73e91-af5d-4860-bb94-56899ef5c79a/el_seor_de_las_moscas_resea_del_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/common_ielts_essay_topics_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/13008147630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f8d316-0c65-418e-a97f-4f871a9400de/43840129349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d929cd23-777f-4228-87c2-7e99410baffa/what_is_the_correct_way_to_address_wedding_invitations.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/91422554318.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/assam_chemistry_olympiad_past_papers.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/lefidikozinetivolupazeki.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/74635350395.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_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 5456 bytes
SHA-256: 290f6bc7da14826c75b52de45b9d254b38854caa9efc95649686bf1ddb645b38
font_01_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 11076 bytes
SHA-256: 3afef769c35e57354ab713801d04254f18617e0e3d3646ee25d9f1f34d3d1884

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