Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd69e0e0043fd38…

MALICIOUS

PDF

34.6 KB Created: 2020-06-08 10:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d33ada690497bf6560310ca004426f9e SHA-1: 270854ec3f67e9e1afe2fc51f1478ed9af3bfec3 SHA-256: bbd69e0e0043fd389e4e2082be844780178ad9c89f353775f14f37de6cab7133
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, includes a URL that matches one of the extracted links, suggesting a lure. The primary purpose appears to be directing users to a network of websites, likely for SEO spam or to host further malicious content.

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://msgarletts-hancock.com/uploads/1/3/0/2/130272613/130272613.html#libros+de+estadistica+para+administracion+y+economia+pdf
    • http://4cw.undesirable.us/uploads/1/3/0/8/130813618/sawamaveb.pdf
    • http://webmail.newforest4me.com/uploads/1/3/1/3/131382583/4364098.pdf
    • http://autodiscover.academiahec.com/uploads/1/3/0/7/130775827/javumikelerujekupox.pdf
    • http://femmefatalebeauty.net/uploads/1/3/1/3/131381519/wosilax.pdf
    • http://yousosalty.net/uploads/1/3/0/4/130488244/jogepepibolato.pdf
    • http://timbeccuecello.com/uploads/1/3/1/3/131380292/6837212.pdf
    • http://elmoshade.com/uploads/1/3/0/5/130539035/7958886.pdf
    • https://jipebowojor.files.wordpress.com/2020/06/gosisuborakagevijob.pdf
    • https://joselolede.files.wordpress.com/2020/06/situweterekosixiw.pdf
    • https://lanotojuvon.files.wordpress.com/2020/06/56349018944.pdf
    • https://kexunezelip.files.wordpress.com/2020/06/77627716806.pdf
    • https://lusunum.files.wordpress.com/2020/06/95739919109.pdf
    • https://gekasoduvog858287101.files.wordpress.com/2020/06/wageroniwusak.pdf
    • https://lamoner.files.wordpress.com/2020/06/29624459357.pdf
    • https://libaxomejuj.files.wordpress.com/2020/06/xovilisifamafewod.pdf
    • https://zisagan.files.wordpress.com/2020/06/58243409955.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_off00005c65.bin
53e07e4f9b0a05f8a4405d77787dac9aa8d26d0da277844ddc1e9c2146f4b6ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C65 10368 bytes

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