Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5160cb491b2d0ff…

MALICIOUS

PDF

36.4 KB Created: 2020-06-15 03:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b5b9ed67b0ac966250feb6e24137d7d SHA-1: 4e62a886da40137056df5eada7c13725d9dc5f28 SHA-256: e5160cb491b2d0ffe05ff7b9ab841efb87129bf5f6c38daa05f4564083da8edb
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, many of which are hosted on domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains references to 'Ibm 4528 service manual' and embedded URLs, suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://rhspca.com/uploads/1/3/0/5/130550666/130550666.html#ibm+4528+service+manual
    • http://valozo.com/uploads/1/3/1/4/131454033/4bad170de0a8.pdf
    • http://audirecounselling.com/uploads/1/3/0/8/130814110/7543433.pdf
    • http://a-199-34-228-100.yuvalamihai.com/uploads/1/3/1/3/131383228/tapuka.pdf
    • http://telgarskytravel.com/uploads/1/3/0/6/130604158/5fad0541e4d94.pdf
    • http://lesbonssavons.com/uploads/1/3/0/7/130738543/9132fcb91c5.pdf
    • http://btmamusic.com/uploads/1/3/0/6/130605016/depelulidiluz_dobaw_sofav_bovedib.pdf
    • http://southernbritches.shop/uploads/1/3/1/1/131163683/3553087.pdf
    • http://coastalinspirationsbook.marissaoneil.com/uploads/1/3/0/5/130590535/2597833.pdf
    • https://gunilejemixi.files.wordpress.com/2020/06/45153974921.pdf
    • https://nosuvul.files.wordpress.com/2020/06/walefijeverejavopugiwu.pdf
    • https://didupovuw.files.wordpress.com/2020/06/66104274121.pdf
    • https://mozujunovuj.files.wordpress.com/2020/06/92932712621.pdf
    • https://jararevus.files.wordpress.com/2020/06/nivobujati.pdf
    • https://dakisil.files.wordpress.com/2020/06/puwop.pdf
    • https://sedexovefun.files.wordpress.com/2020/06/tusugudimavof.pdf
    • https://luragekid.files.wordpress.com/2020/06/wagala.pdf
    • https://pugurikerode.files.wordpress.com/2020/06/fufuveja.pdf
    • https://dezigoko.files.wordpress.com/2020/06/rorofaz.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_off00006050.bin
d510f5745d3123f3374d2a31d3b7af50292432105093b04f13b27201bc0f1648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6050 11212 bytes

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