Malicious PDF — malware analysis report

Static analysis result for SHA-256 028ea87752fb8012…

MALICIOUS

PDF

41.9 KB Created: 2020-11-06 13:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7c10169c2e8d7c2899b45190f3ab5fe5 SHA-1: dc38e0b55865f9b5bac4facf144edaa18c755b9c SHA-256: 028ea87752fb8012c0e5a2c2207fbfee6a2415348ad9d05a2833f3784a00a667
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7971455.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://trafficel.ru/aws?keyword=major+mayhem+2+mod+apk+download PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7971455.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/fupad.pdfIn PDF document text
    • https://xojuliwujugiseb.weebly.com/uploads/1/3/4/3/134388488/buneninajubesokibano.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/8738977.pdfIn PDF document text
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/rogewoziwe_wizuk_voxagivofeva_rafusowipaj.pdfIn PDF document text
    • https://davijoxo.weebly.com/uploads/1/3/4/3/134357566/fudesomabezopawekuxe.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/robazoriwosisi_kopasugebekise_bakatupoxuwuz_jowawelozisefe.pdfIn PDF document text
    • https://nepufetok.weebly.com/uploads/1/3/1/4/131438640/zotesi-julawutazodazas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zabevog/commanding_your_morning_prayer.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/anatomy_trains_tom_myers.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/uses_of_bitter_kola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a522ebe-10d5-4c0e-8784-3de0808df97e/duxinenilanowosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b636bd9-5c0a-4d52-afdc-285589cbf55c/lolizalixekivujexu.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/capital_one_account_restricted_meaning.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_off0000640b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640B 5492 bytes
SHA-256: a66ba3534b5bf362cb6af4658a50d07baca34e86c9a7c3df1b1e0daa9d644507
font_01_sfnt_off000076b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B7 10744 bytes
SHA-256: 0a2b498b64becf4ed4c5ba9aed4a42896bea037cdcf03c8fd25c7e8ea94fb1c7

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