Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde8e6cca8d1576f…

MALICIOUS

PDF

36.9 KB Created: 2020-03-29 07:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 29efb2474bb3c4fc2e3e0840c77544ec SHA-1: b758c5455c8fbff0489b7244bf88b1c847a2ff92 SHA-256: cde8e6cca8d1576f0d7103ef9e7e12b1fcfc0628b95046994fce9a720e370b4b
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The embedded URL points to a page with unrelated text, further supporting the idea that the links are the primary mechanism for malicious activity, likely directing users to further malicious content or phishing pages.

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-63-204-18-4.benefitplans.org/uploads/1/3/1/4/131437241/131437241.html#nerf+sledgefire+extra+shells+for+sale
    • http://nelancasterhub.org/uploads/1/3/0/7/130776399/tovurir.pdf
    • http://thesouthernsideline.com/uploads/1/3/0/8/130874067/nivox_tukaj.pdf
    • http://proximal50.net/uploads/1/3/0/7/130739068/desokatu.pdf
    • http://hairbyjerr.com/uploads/1/3/0/6/130622022/dapevi-vovilizipuri-pukalepupawifi.pdf
    • http://kdecorevents.com/uploads/1/3/0/6/130621155/fuziwoki.pdf
    • http://southmountainbattlefieldguide.com/uploads/1/3/0/4/130435531/sexugegib_dabefig.pdf
    • http://www.mysuperiorcuts.com/uploads/1/3/0/5/130540282/xurowuribib.pdf
    • http://thepowellcompaniesllc.com/uploads/1/3/0/7/130776264/rezifonadujora-vijurifijix-roxalulilafuzet-sugir.pdf
    • http://www.sowerhk.com/uploads/1/3/0/3/130323517/5069896.pdf
    • http://tkobg.com/uploads/1/3/0/2/130270977/90ad5567a4e.pdf
    • http://www.messianicmetis.ca/uploads/1/3/1/0/131070169/nuzoputopatasasa.pdf
    • http://mta-sts.mail.sandyblaisdell.com/uploads/1/3/0/8/130813696/1a5a10615f.pdf
    • http://tickled-ink.co.uk/uploads/1/3/0/6/130621443/suxox.pdf
    • http://peccatumgule.com/uploads/1/3/0/6/130621043/kipowuvurogo.pdf
    • http://dreamfarmeracademy.com/uploads/1/3/0/2/130270812/ruwewalajavumum_texevajabig_nikazejogidiso_kurodilegegofu.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_off00006593.bin
453d8d39bbe8b984e303d21590b6d1cbe27dc0fdfad398a0b44f845c0d7b0b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6593 8556 bytes

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