Malicious PDF — malware analysis report

Static analysis result for SHA-256 af93de1bdd31784b…

MALICIOUS

PDF

56.7 KB Created: 2020-04-03 09:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 07cb604494ce79e70c8c4c43bbbd2834 SHA-1: 0b4e43f1d25a563029fff0b403bbc5f9e263d0ce SHA-256: af93de1bdd31784b3df6d21cc35ff9435f05572cccbd2eb085a7ac95e5619e7a
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 to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on these numerous external sites. No scripts were extracted from this sample.

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://thesoonernetwork.com/uploads/1/3/0/4/130483956/130483956.html#all+four+stars+book+summary
    • http://informationsecuritypoliciesandprocedures.com/uploads/1/3/0/6/130639309/7749855.pdf
    • http://criarqarquiteturaengenharia.com/uploads/1/3/0/7/130739059/1398651.pdf
    • http://mef1931.org/uploads/1/3/0/8/130874127/dawuteposimefodalew.pdf
    • http://palisaderock.com/uploads/1/3/0/5/130541133/9c322b5d1f48.pdf
    • http://portadoggy.com/uploads/1/3/0/2/130287472/kuwanisab.pdf
    • http://lalasunnyjewels.com/uploads/1/3/0/2/130271207/39c1fea.pdf
    • http://carjbe.shop/uploads/1/3/0/2/130289271/0228895eb94.pdf
    • http://blynncreations.com/uploads/1/3/0/4/130436094/rogan.pdf
    • http://concretecuttingloganut.com/uploads/1/3/0/5/130543483/sopulafuka.pdf
    • http://chrisharrisconstruction.com/uploads/1/3/1/1/131164545/a01e5a83a09.pdf
    • http://vpacapital.com/uploads/1/3/0/7/130738732/danivezozokupo-rugok.pdf
    • http://rottenapplebackpackers.com/uploads/1/3/0/4/130490444/foxoboweko_belupiwegukiros.pdf
    • http://cordeliabradby.com/uploads/1/3/0/4/130483390/winuwotitoza_gavotuligesop_xutiteru.pdf
    • http://demolitionstudio.com/uploads/1/3/0/7/130775392/fe77cfda1.pdf
    • http://avrminingservices.com/uploads/1/3/0/5/130546519/4934959.pdf
    • http://ninebotours.com/uploads/1/3/0/6/130604473/dinenowebejoka_junobu_ponigom_mawitibe.pdf
    • http://paperdollsandoutlaws.com/uploads/1/3/0/6/130604202/3213589.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_off0000b49e.bin
bd4d86956b35a442a2d0a0a55896286614210469dfdb71df3db3faae6fc354e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB49E 8708 bytes

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