Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7ed5d0651dcc17…

MALICIOUS

PDF

36.9 KB Created: 2020-05-21 12:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 170bc7cc663f6f41086f78cf27da0ac2 SHA-1: 1a3ad150d05a3216b996eebdd35a70bf90c45c1c SHA-256: 2b7ed5d0651dcc1743af420e6d71766b4269406686eedb2dbb834579c054d3ae
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a vast network of external PDF documents, likely for SEO manipulation or to serve as a distribution point for further malicious content. No scripts were extracted from this sample.

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://aboriginalart.services/uploads/1/3/1/4/131406606/131406606.html#mkx+concept+art
    • http://finaxio.com/uploads/1/3/0/4/130476587/jemizum-kurukutebinot.pdf
    • http://nagsthlm.com/uploads/1/3/1/8/131871796/d8059.pdf
    • http://covehawaii.com/uploads/1/3/0/7/130739528/5499411.pdf
    • http://marinotileinc.com/uploads/1/3/1/8/131855992/fijawise.pdf
    • http://rusticjackalope.com/uploads/1/3/0/4/130435520/puwawagek-vejumunedorener.pdf
    • http://jstephenperry.com/uploads/1/3/0/4/130488542/3ba58b495e00e.pdf
    • http://bixbyhomeremodelingsale.com/uploads/1/3/0/7/130739674/8908189.pdf
    • http://echonormal.org/uploads/1/3/0/6/130604423/80cdd54369f0b.pdf
    • http://manebeautysalon.com/uploads/1/3/0/6/130604546/8158278.pdf
    • http://wordsbyashley.com/uploads/1/3/1/8/131856109/7645c1f2a9e3b6.pdf
    • http://gtwservices.net/uploads/1/3/0/3/130379431/e8df8b3.pdf
    • http://lmbrowsandbeauty.com/uploads/1/3/0/6/130640141/wufola-goroxukuzir.pdf
    • http://nolihosting.net/uploads/1/3/1/6/131636678/puvefunot.pdf
    • http://highdeserttactical.com/uploads/1/3/0/4/130488846/deca16a40d8b2.pdf
    • http://411161st.com/uploads/1/3/1/4/131405976/jufav.pdf
    • http://vincenzas-crostoli.com/uploads/1/3/0/8/130873810/5015590.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_off000062a1.bin
0f2a3c48db8672c5f1bf0ef037916495ed90eb5d60acac851f25e6a5b618ecab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A1 11196 bytes

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