Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5905cdc174615cb…

MALICIOUS

PDF

42.6 KB Created: 2020-11-06 21:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3c5e29ecceb2215f360480af7b0cd924 SHA-1: 96743123e9a671a007393e25ffae6f8eecbcf1dd SHA-256: b5905cdc174615cb9cc94adf959da9ef01b6e3db067d912e5296c2e90320c304
76 Risk Score

Malware Insights

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

The PDF contains an embedded URL that functions as an SEO redirector, identified as a lure for free downloads and phishing. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting the file's purpose is to trick users into visiting this site, likely to download further malware or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/aws?keyword=wtw4816fw+manual+english PDF link annotation
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/tofezejamiremi-jiwat-wakidunusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5f948a912410a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5f8cc836de168.pdfIn PDF document text
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/6d875b22255267f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5fa1edef2cc44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5f962682309ea.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/7865484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f8a4fdd639d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5f8dfd5fd12ed.pdfIn PDF document text
    • https://jabuzowe.weebly.com/uploads/1/3/4/3/134312688/mozeluf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f8a175b63c1f.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/wukara/17977950532.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/10882270357.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/bejukisobodojotibomoxuf.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/future_problem_solving.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/tazavajuzizerotisobisuwu.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_off0000575c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x575C 5452 bytes
SHA-256: 6b0ebdc4885b8e7431b8f99a68d0063546c8c80a893e0dd1eca4275c0689d1ef
font_01_sfnt_off000069d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D9 11280 bytes
SHA-256: 67d703bf06866166c0d0e883fa89090a3cdaa6aa714fecb5a586b1b9ecd349c8
font_02_sfnt_off00008ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e