Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8465cc0b8950dfd…

MALICIOUS

PDF

40.9 KB Created: 2020-03-13 11:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c5714cdc48bec15876faf61d0491d535 SHA-1: 19ea723b3fd0b6bc51b272597933064e58f727c6 SHA-256: b8465cc0b8950dfdbc6a0905bc25abfd57adbb165e32b90d21f3fb3a261ac151
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, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that points to a collection of other PDF files hosted across numerous domains. This suggests a link farm or SEO manipulation tactic, potentially used to distribute malware or phish for credentials.

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://cityonloc.com/uploads/1/3/0/6/130604671/130604671.html#posesivos+de+los+pronombres+personales+en+ingles
    • http://www.mountainflowermassage.com/uploads/1/3/0/5/130550972/4604894.pdf
    • http://myhilocollection.com/uploads/1/3/0/6/130639479/c1d55.pdf
    • http://mrreynoldsmathclass.com/uploads/1/3/0/2/130288720/noluxononazujej_gujuvivuliv_supifetotexesuw.pdf
    • http://www.psychedelicsmadnessawakening.com/uploads/1/3/0/7/130739059/e1d574.pdf
    • http://kenzeesklozet.com/uploads/1/3/0/7/130740342/fokutosevoxiwenir.pdf
    • http://tinytreasureschildcarecentersc.com/uploads/1/3/0/5/130588288/zekopetakufobexa.pdf
    • http://neilcopes.com/uploads/1/3/0/9/130969352/7557342.pdf
    • http://mail.seethejoy.net/uploads/1/3/0/4/130476485/46f726991a5.pdf
    • http://willdais.com/uploads/1/3/0/7/130775715/pivupataduneku.pdf
    • http://www.eaglecrestoa.com/uploads/1/3/0/5/130551585/vatevo-xubanuxi-wibiloxod-lozapufoxijog.pdf
    • http://carlyatthelandings.com/uploads/1/3/0/5/130550937/2068928.pdf
    • http://www.iglesiahispanadebradford.com/uploads/1/3/0/2/130272474/0c42aac2.pdf
    • http://mail.epicrop.com/uploads/1/3/0/5/130543684/4374924.pdf
    • http://mollygaston.com/uploads/1/3/1/0/131071033/jijeviseson.pdf
    • http://integrated-immunology.store/uploads/1/3/0/3/130323311/0d397f8e236669.pdf
    • http://z.ag/uploads/1/3/0/6/130621226/6705091.pdf
    • http://beyondjordanarise.com/uploads/1/3/0/2/130288421/4920957.pdf
    • http://suv-tahoe-99.net/uploads/1/3/0/6/130620909/2160963.pdf
    • http://www.valleyvintageshop.com/uploads/1/3/0/5/130543656/4226828.pdf
    • http://www.parateviamdomini.org/uploads/1/3/0/6/130620431/6947695.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_off000075e1.bin
06fb2dbcae6cd63331a0cdecf33871fe54f934eb7878b8191cf130d049fce6b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E1 8784 bytes

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