Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8282566a2505b19…

MALICIOUS

PDF

141.6 KB Created: 2020-11-03 15:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4a866b1facd25ccbeac5b55a64467ac7 SHA-1: d0863746342a4092b661121195784eb8c00c6d28 SHA-256: a8282566a2505b19ff554c1fd8bbe4e92466e0d5d863c9f11fd0cba356286c9a
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that lead to known malicious redirector infrastructure and impersonates the brand 'DhL' for credential phishing. The document body, though heavily obfuscated, contains a URL that appears to be part of the lure. The presence of multiple PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/jusifenulijukaw.pdf.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ggtraff.ru/123?keyword=standard+form+of+store+lease+new+york In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f88a05e24257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f89223580258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_5f9e5e9d24a69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f90af2b22311.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/jusifenulijukaw.pdfIn PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/df4f39f5d635.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/gupuso/koduvotiwokasowawobu.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/bill_of_lading_act_1856.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/gimisimelovuzefin.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/40958491281.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/mutated_bloodveld_guide.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_off0001efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFCF 5416 bytes
SHA-256: 9d4d277166e47cf0c6be33d5749fd890ac53ad2ab6678ccbda64cc7c5d9cda8b
font_01_sfnt_off0002023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2023D 11416 bytes
SHA-256: aac4b2af191253ccd9a768841334bad61cbfe2191f4d70b8d0a78458e2ea0ccb

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