Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c10ce682d6a897…

MALICIOUS

PDF

33.2 KB Created: 2020-05-02 14:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4a1823012b628413383ca2ebea5e69c9 SHA-1: ddfa30478c46569d85d72b9091b9569a3254b9b3 SHA-256: 83c10ce682d6a8976753b9c152886ab02d83f24adf74718fa88e94ec3e6f7a7b
136 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 point to other PDF files on unrelated domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://klokkeraadgivning.com/uploads/1/3/0/7/130775075/130775075.html#akhiyan+de+kol+teri+video+song
    • http://realestatefilming.com/uploads/1/3/0/2/130289347/d992601af89fd2.pdf
    • http://dorothynellcraft.net/uploads/1/3/0/8/130874339/53c813d.pdf
    • http://uconnpremedicalsocietynewsletter.com/uploads/1/3/1/6/131607889/7959669.pdf
    • http://fleshandbloodfantasy.com/uploads/1/3/0/4/130483194/wexot.pdf
    • http://footplayusa.com/uploads/1/3/0/8/130873863/xogatemusaf_fotiwo_rawavesudeno_xomuxoripala.pdf
    • http://rosscreekstore.com/uploads/1/3/1/4/131437725/davowebikezar.pdf
    • http://mysimplyblingfor5.com/uploads/1/3/1/4/131453397/ranelajetezosiz.pdf
    • http://feedinghelpinggeorgians.org/uploads/1/3/1/6/131637896/ragirazanatanizu.pdf
    • http://vitalvantage.com/uploads/1/3/0/6/130621345/safopoxuno_lukuzu_xogurilesewo.pdf
    • http://thebeautymamashop.com/uploads/1/3/1/0/131070497/9f89a.pdf
    • http://lalunasoul.com/uploads/1/3/0/8/130874570/1297825.pdf
    • http://flowm.io/uploads/1/3/1/4/131438135/1543667.pdf
    • http://performancelecture.com/uploads/1/3/0/2/130271187/jixogig.pdf
    • http://gilcrest-center.com/uploads/1/3/1/4/131454098/xinunava.pdf
    • http://discipleshiptraining.org/uploads/1/3/0/7/130776279/0bd2b91bb90d.pdf
    • http://ape-ron.com/uploads/1/3/0/3/130323173/f3ba570fc.pdf
    • http://centraldirectms.com/uploads/1/3/0/5/130590661/e5c05.pdf
    • http://facespromotions.org/uploads/1/3/0/9/130968973/gunelazasakoda.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_off00005a9f.bin
dabaff2be579b738cb3d274e211a592e2dfeee730b0cc13a86f6ec3e697874d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9F 7592 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.