Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57a9357f7636895…

MALICIOUS

PDF

41.6 KB Created: 2020-03-29 12:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce0fa565d38c061054f2517ca13310fc SHA-1: 2f7e24e7cc6ef91f2fe2815c88d89a8986105413 SHA-256: e57a9357f7636895e3f17ebc2159a96f8847888000271610eceefab7c023311d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, many of which point to PDF files hosted on unrelated domains. The document body text, while appearing innocuous, is likely a lure to encourage users to click on these links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm, a common technique for SEO poisoning or distributing 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://adsl-63-204-18-21.benefitplans.org/uploads/1/3/0/7/130775490/130775490.html#how+to+use+meat+probe+on+kitchenaid+oven
    • http://businessplus-site-editor.com/uploads/1/3/0/3/130323522/e3d524860.pdf
    • http://ict4l.info/uploads/1/3/0/2/130272394/favubunuxa.pdf
    • http://lorilevin.com/uploads/1/3/0/7/130739944/rigixa.pdf
    • http://yesbyronbay.com/uploads/1/3/0/7/130775119/1131794.pdf
    • http://orthostice.com/uploads/1/3/1/1/131164104/d9203a58a.pdf
    • http://campmonty.org/uploads/1/3/0/8/130813669/xumonifuwo-biboweru-lavile-serunaniwol.pdf
    • http://urbanrusticchicago.com/uploads/1/3/0/6/130639764/botobi.pdf
    • http://psquaredecommercellc.com/uploads/1/3/1/1/131164537/6500430.pdf
    • http://partij-neeleman.nl/uploads/1/3/0/2/130273589/1668383.pdf
    • http://huntingtonbeachmurals.com/uploads/1/3/0/3/130313130/xakakudigow-gazefunad-senokavosokeb.pdf
    • http://starharthern.art/uploads/1/3/0/6/130604428/zapagakeketi.pdf
    • http://manchester-masonry.com/uploads/1/3/0/5/130550983/volelama.pdf
    • http://eastcoastlash.org/uploads/1/3/0/4/130435956/davorove.pdf
    • http://honeycombsalon.net/uploads/1/3/0/9/130968935/luziginejuvusedex.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e74.bin
fe3bfe25e171c2894896e4eefb45c4c7210d31bc58837368b78021e7c0ad4382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E74 8400 bytes
font_01_sfnt_off00008eb8.bin
cfb3357b20fb01955c1e4a0ed568c791e3a97db8f0fbaa18432a833eaa1d19da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB8 2828 bytes

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