Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c34812def77c0f5…

MALICIOUS

PDF

81.3 KB Created: 2021-02-15 12:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8b91cd7b93e2ce6d9c6f84b1dbe27523 SHA-1: 817149b86bfd3707842b60d4c02bb2f46eea27c6 SHA-256: 8c34812def77c0f5fd0da144c10770b88bf612f756b20c4dae82182f0cecf05d
246 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically flags it as a credential phishing lure, likely using a redirector to a malicious site. The ClamAV detection and ML classifier further confirm its malicious nature, suggesting it exploits vulnerabilities or tricks users into downloading further payloads.

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://tabanaxil.weebly.com/uploads/1/3/1/8/131857193/8f371358890d.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/wix?keyword=aswb+masters+exam+study+guide+pdf PDF link annotation
    • https://tabanaxil.weebly.com/uploads/1/3/1/8/131857193/8f371358890d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5ff70c7d61131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485801/normal_5fdb143d654b0.pdfIn PDF document text
    • http://subfamjtii.site/biografia_de_oscar_cosio_mayorquin3isst.pdfIn PDF document text
    • https://bitigufej.weebly.com/uploads/1/3/5/3/135337089/19a09f5.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/lugexazuboleziv_biwesokuwubizib_mapigupole_gaweribepaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482402/normal_5fee06ebb9481.pdfIn PDF document text
    • https://womawojixamukof.weebly.com/uploads/1/3/0/7/130740010/5558042.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/bigelesulug_dazena_lonuninowa.pdfIn PDF document text
    • https://jemijibiwozigep.weebly.com/uploads/1/3/4/8/134855884/5870667.pdfIn PDF document text
    • http://cancandance.org/dafazaxelidavukofol5ghrp.pdfIn PDF document text
    • https://ritefebeg.weebly.com/uploads/1/3/5/3/135316582/tosivipexuxu.pdfIn PDF document text
    • http://igafnd.org/50146057569z24ru.pdfIn PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/8886122.pdfIn PDF document text
    • http://draiwenstore.online/fall_guys_game_ps4zlbzq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494893/normal_601463a92b2ec.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://s3.amazonaws.com/xomudufe/keretus.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/40143579960.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/android_app_translate_chinese_camera.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/red_hot_chili_peppers_hits_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/weekly_menu_and_grocery_list_template.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_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 5384 bytes
SHA-256: d4fe9386986be8f8eb7cb7578155f120fee33585a8c3019c4553e349c821b799
font_01_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 10352 bytes
SHA-256: 12ef5aa100888a14f411ca5335585cdcbb1131cae4f9dc360e4785a8dff57d91
font_02_sfnt_off00012913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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