Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77afef500bf52c9…

MALICIOUS

PDF

76.0 KB Created: 2021-03-06 13:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6182d3a62c7f6d631a11baac4576c497 SHA-1: a69799c0892d4f4ab64a3ed6f45afce512880489 SHA-256: a77afef500bf52c9a35c8e1a353b1129a513b808543101324bd839e57ab52af1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed for SEO manipulation. One of these links redirects to a credential phishing lure impersonating Apple, using a known redirector. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document. The presence of multiple external links and the credential phishing lure indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://buzubexod.weebly.com/uploads/1/3/4/0/134017192/6079097.pdf.
  • 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://baarspo.ru/strik?utm_term=farewell+to+manzanar+chapter+13+questions PDF link annotation
    • http://pasendapp.online/xanuzodazugepeputotufoey9zc.pdfIn PDF document text
    • http://laitlabs.pro/zafenoe0yl.pdfIn PDF document text
    • http://rkconstructionsucks.com/within_temptation_faster_isle_of_man_ttddl4n.pdfIn PDF document text
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/6079097.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/ordinary_differential_equations_problems_and_solutions.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/dark_knight_returns_joker_death.pdfIn PDF document text
    • http://instapodarok365.site/ti-84_plus_silver_edition_does_not_turn_onny77t.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/02cf43c.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/1400457.pdfIn PDF document text
    • http://dreabling.online/rosalenaposuzfrjah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogoxuf.atwebpages.com/cognitive_behavioral_therapy_techniques_for_generalized_anxiety_disorder.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_9fd20f7246b94693baa8d61e8033b721.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/befarekogol/how_to_repair_a_kohler_kitchen_faucet.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/bootstrap_navigation_bar_templates_with_logo.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_2c3966ba739f443984a38203c9b31b96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/transformateur_bobine_point_neutre.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/34779797042.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_b0601bd8a20c4220b7852e99fd2663cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/begijufadi/86089725748.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_47c564848bd841cd9ff2aa6c9b5980d7.pdf?index=trueIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_6292c4f4abf04914b56fc596fcf07e21.pdf?index=trueIn 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_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 5612 bytes
SHA-256: a6d9552e24c12813926af37b6e9f2691c16a53a8ee3e0c92b8e1c3270c15742c
font_01_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 10480 bytes
SHA-256: 01b0f1674cef7fff55f5eaad994887e4c91b4d55e75a3c8b7795c31c548e9c8a

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