Malicious PDF — malware analysis report

Static analysis result for SHA-256 5831d2d583343365…

MALICIOUS

PDF

74.2 KB Created: 2020-11-30 12:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 94ef3c9ba0de9e3d6b9931864f27dbdf SHA-1: 177c4e18f4d4d103c235a1686744ab80db0fae47 SHA-256: 5831d2d583343365861f4149e84cd081ec36fadd65845b0d98150c213838fde5
274 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple critical heuristics for malicious redirector links and brand-impersonation credential phishing, specifically targeting Amazon. It contains numerous embedded URLs, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the phishing lure suggest an attempt to redirect users to a compromised site for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mozosuroje.weebly.com/uploads/1/3/4/4/134456199/dewil.pdf.
  • 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://traffmen.ru/aws?utm_term=practice+with+the+hinge+theorem+worksheet+answers In PDF document text
    • https://mozosuroje.weebly.com/uploads/1/3/4/4/134456199/dewil.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/8854658.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/31ab1b29-eefd-4de5-b217-94be62486f2c/50_tons_de_liberdade_legendado_compl.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e703bda9c57a97be38fb/t/5fc4a5e54e98326c02a4d26e/1606723047588/xakatexodila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa8afbb-d875-4a95-bda6-827b389b8196/64434131342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27a3519-8099-4c58-8b9c-82abcd157457/22735365449.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe06f418e72e5fdb9dbf5c/1606289142886/tf_memory_card_amazon.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf90e3485235c868b3646/1606285582781/pamugaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/11710634733.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfb2312cf09257bd651d14/t/5fc460d82dd96f5918798eb0/1606705368665/drawing_vk.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/kozenimelosakinuliwupub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf67dc61e25426e130f6f8/1606379485591/gypsy_jazz_guitar_scales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36140a0-8bd1-4678-976d-4296f9fa4b88/the_complete_book_of_origami.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB691 8944 bytes
SHA-256: 134ec639312db25e4d385c532bc3a7b144b2532fef53e7cf7df77c3097900e58
font_01_sfnt_off0000cea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA3 5336 bytes
SHA-256: 2afeb15d310bc087aacc328516fca5aec5c85d1e5ac3e67b919f3954053d5168
font_02_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 10228 bytes
SHA-256: dae46510e80b29ebeb72872aaae3d796796174c408ad7ae78291116d9661bcb1
font_03_sfnt_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 16192 bytes
SHA-256: 9695cce628265d98fe19231c89d6261270092a6237be2caed840ef37b28e60e4