Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d80184db54cc7a9…

MALICIOUS

PDF

79.9 KB Created: 2021-01-12 08:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7551dbbdb564ddc64f4ece794ae76173 SHA-1: 1e49bfe13a121927e2e2d01de4adddbe6a9765be SHA-256: 7d80184db54cc7a9fc1bed5d21b05611bbb99f165b0c1a270be9ce28c6300ecc
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or distribute content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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?utm_term=orchid+yellow+leaves+root+rot In PDF document text
    • https://site-1166621.mozfiles.com/files/1166621/giant_io_mod_apk_latest.pdfIn PDF document text
    • https://site-1178794.mozfiles.com/files/1178794/castaway_survival_island_demons.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/NThfjgV/lemonade_stand_sign_free_printable.pdfIn PDF document text
    • https://vinovebavelugis.weebly.com/uploads/1/3/1/3/131383284/1028450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5ff8c2ef2a8ab.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/1japHhb/15448100158.pdfIn PDF document text
    • https://bidukupe.weebly.com/uploads/1/3/4/3/134348295/1652747.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/uxYntjg/43013870612.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/nopomewegobij/by_the_waters_of_babylon_title_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/asphalt_8_for_mac_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/printable_coloring_bookmarks.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/39895173045.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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 4988 bytes
SHA-256: 5cefd041636fc81857410767a8a2ad078d5b5f797a70dad64276bddf207184ae
font_01_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 10760 bytes
SHA-256: bdc47e99b09a3f5fafedcd7d4adabffea3be8c06f29c1755b4a17d6c6b92c9d0
font_02_sfnt_off00012494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12494 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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