Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca8e99b1ab3e770…

MALICIOUS

PDF

44.8 KB Created: 2020-04-20 07:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d9601194c1123f87a45658b754e583b9 SHA-1: 26bb4eed8ff11aeab71a8679492034cb63923fa4 SHA-256: aca8e99b1ab3e770a7072b16a81e7fe776c90c47e08f778ad50b0ccbc57bdc10
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam tactic. The ML classifier strongly indicated maliciousness. The document body, though partially garbled, contains text related to a 'Baumann 84000 sanitary control valve manual', which is likely a lure to disguise the malicious intent of directing users to numerous external URLs.

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://sweetestdreams.org/uploads/1/3/0/8/130813804/130813804.html#baumann+84000+sanitary+control+valve+manual
    • http://snowmobilevacation.org/uploads/1/3/1/3/131381682/xawikipetajeb_ruvigofiseripa.pdf
    • http://thedeeportergroup.com/uploads/1/3/0/6/130603841/vinuvoveso_zejuru.pdf
    • http://action-photobooth.com/uploads/1/3/0/7/130739560/7941582.pdf
    • http://shopnalanisbeauty.com/uploads/1/3/0/6/130604616/kuletoge.pdf
    • http://areaair.space/uploads/1/3/0/5/130543289/93bb6f0fd5.pdf
    • http://thequeensofheart.love/uploads/1/3/0/2/130270914/bewapigoxadabiti.pdf
    • http://sierrasun.ca/uploads/1/3/1/0/131071290/604591.pdf
    • http://cheeksaz.com/uploads/1/3/0/5/130551880/xiliwosopun_wojapezumozef_bomukexew.pdf
    • http://arlinex.com/uploads/1/3/1/3/131379678/71ae7f4843e2806.pdf
    • http://akhnasemi.com/uploads/1/3/0/7/130739704/6211759.pdf
    • http://pierrerodriguez.net/uploads/1/3/0/2/130289367/zupusuwexawojubirut.pdf
    • http://makersdalliance.com/uploads/1/3/1/0/131071312/kapikito.pdf
    • http://mrsbhatt.com/uploads/1/3/1/3/131383514/7230786.pdf
    • http://drcstaxaccountingconsulting.com/uploads/1/3/0/4/130489082/vijanese.pdf
    • http://thefinechocolateboutique.com/uploads/1/3/1/4/131454496/balixarax_pejumi.pdf
    • http://cheeksaz.com/uploads/
    • 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_off00008880.bin
04be55787369aeb40df6171bf82e846034ba7a5ed0937657ab20ecabd0615c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8880 7896 bytes

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