Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cd6437246ccef7…

MALICIOUS

PDF

39.5 KB Created: 2020-03-08 10:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3d248ad9222a6dfb24c539a9b34fa4cf SHA-1: 2e88b360030b509d53f9ee89af34feda02f2c8fa SHA-256: 18cd6437246ccef7e4a8284fd190f1ce42677b5a34e5e802d79159e470a92e1a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URLs supports the assessment of a malicious intent to redirect users. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://www.albanyenvironmentalengineer.com/uploads/1/3/0/4/130477351/130477351.html#adafruit+feather+32u4+rfm96+lora
    • http://thetruth4me.com/uploads/1/3/0/5/130543539/e5385e4f6.pdf
    • http://tampadentalemergency.com/uploads/1/3/1/0/131070356/takofijubufopiru.pdf
    • http://natureswonders.net/uploads/1/3/0/2/130273894/ruvutasozimugidubod.pdf
    • http://pharrfamilychiropractic.com/uploads/1/3/0/4/130476168/jubitasokibe_didifawu.pdf
    • http://www.closetsmile.com/uploads/1/3/0/4/130483804/gulex.pdf
    • http://www.xxlleague.com/uploads/1/3/0/3/130379213/gojav_bikomosusi_gamaparaweru_lofanugoxidisem.pdf
    • http://marcelrosca.com/uploads/1/3/0/6/130604168/6448439.pdf
    • http://higherpowerjourney.com/uploads/1/3/0/4/130436441/1784425.pdf
    • http://autotransportcheap.com/uploads/1/3/0/3/130312980/zegekixi-sepibironajudum-kelujodagu-vajugik.pdf
    • http://katharinebierceyoga.com/uploads/1/3/0/7/130740003/a50db0bb51804d.pdf
    • http://beatsbytheharv.com/uploads/1/3/0/6/130605368/joxoranaxupoba.pdf
    • http://marshalinehan.com/uploads/1/3/0/5/130551179/xerinukeriw-kudepi.pdf
    • http://www.milton-trails.com/uploads/1/3/0/6/130621582/jeses.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_off00006e75.bin
8dcf19283448885272777f4517b5d23202854921dc2dc88e1de77176f9420379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E75 8652 bytes

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