Malicious PDF — malware analysis report

Static analysis result for SHA-256 7518a75637963401…

MALICIOUS

PDF

47.3 KB Created: 2020-03-30 05:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: c9633d72fa4789d2852e08b5581cc490 SHA-1: d698370be570a99fdf9752aff76b4cd657f87baa SHA-256: 7518a756379634011d1dcbcc3eb1966afa672da46a98fe19e009d551df6fcb1b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a heuristic firing indicating a mass external PDF link farm, with numerous URLs pointing to various domains. The document body, though partially corrupted, also contains embedded URLs that mirror these findings. This suggests the primary purpose is to redirect users to a large number of external resources, likely for SEO manipulation or to serve malicious content.

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://melbournehotelplaceholder.devsite-1.com/uploads/1/3/0/2/130274304/130274304.html#frases+celebres+sobre+la+lectura+cortas PDF link annotation
    • http://kevinortizsf.org/uploads/1/3/0/6/130621847/jewunogunatoka.pdfIn PDF document text
    • http://www.1stumcstudentministries.org/uploads/1/3/0/8/130813547/tapusobesoramuwi.pdfIn PDF document text
    • http://jenniferquiltyrmtcdt.com/uploads/1/3/0/5/130546742/adca42.pdfIn PDF document text
    • http://a2zhomeinsp.com/uploads/1/3/0/2/130272955/2782045.pdfIn PDF document text
    • http://studiosamala.com/uploads/1/3/0/3/130323659/xibipuzalozis.pdfIn PDF document text
    • http://olmanlandscaping.com/uploads/1/3/0/5/130551125/tuvojuxamib.pdfIn PDF document text
    • http://menofzion.org/uploads/1/3/0/4/130476150/ceaf8853ee79.pdfIn PDF document text
    • http://craigallencomedy.com/uploads/1/3/0/4/130483194/pipan_guturo_dodove_xipewodig.pdfIn PDF document text
    • http://heritageportfoliotransactions.com/uploads/1/3/0/2/130289731/sugud.pdfIn PDF document text
    • http://studio-1999.com/uploads/1/3/0/6/130620752/6698561.pdfIn PDF document text
    • http://woodstockvintage.org/uploads/1/3/0/5/130590673/7362251.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1A 9376 bytes
SHA-256: f664c148c38cc4d64159195ef2b511e6df73cc1d6a8b1d96911eda906b680802