Malicious PDF — malware analysis report

Static analysis result for SHA-256 d709dfe64babd0ee…

MALICIOUS

PDF

37.0 KB Created: 2020-04-05 13:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e6cd55a6ba00c60a0915b28573927e03 SHA-1: 6fa14078f57ffdc56154926ae6107a6ccfbcc51a SHA-256: d709dfe64babd0eec468d5816a596396f0128bef4ef3a9cd6a0ed754c88cec18
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure related to free veterinary parasitology books. It exhibits a 'PDF_SEO_LINK_FARM' heuristic, indicating a large number of external links to other PDF files hosted on various domains. This suggests the primary purpose is likely SEO manipulation or to distribute further malicious content through these links. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://josephsgumboday.com/uploads/1/3/0/7/130775714/130775714.html#libros+de+parasitologia+veterinaria+pdf+gratis
    • http://progofor.net/uploads/1/3/0/8/130874413/4746348.pdf
    • http://changeisnowfitness.com/uploads/1/3/0/6/130603958/c323a2.pdf
    • http://georginaamyeventcoordination.com/uploads/1/3/0/7/130775196/tagana.pdf
    • http://charlottebuchanan.net/uploads/1/3/0/8/130874261/newomibazoxigop.pdf
    • http://goodnightmums.com/uploads/1/3/0/5/130588982/fatafusuwora.pdf
    • http://lyndseyhaskell.com/uploads/1/3/0/3/130323733/sizupagogiwe-labibule.pdf
    • http://thesakuradiary.blog/uploads/1/3/0/6/130640004/xewapaf.pdf
    • http://ebookscool.com/uploads/1/3/0/5/130543394/konexonupasosu-zoketaxoguz-zugoxef.pdf
    • http://cristianamente.org/uploads/1/3/0/5/130552106/f896980631a.pdf
    • http://skarpediem.com/uploads/1/3/1/0/131070535/bedeginijap.pdf
    • http://musiccity-doubledutch.org/uploads/1/3/0/3/130313000/8331910.pdf
    • http://ruchiuppalwritingservices.com/uploads/1/3/0/5/130551067/37dd3915335.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006777.bin
e34b1a85b458e90b994787c23ca4ca0cd202d761dd99b2dfd7f6127d83d72bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6777 8560 bytes

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