Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec546f5758a8b8c1…

MALICIOUS

PDF

50.2 KB Created: 2020-04-09 19:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4762c36b86d79f3b385c0aba8dc80e6 SHA-1: 54d319adb0d1eddf5e46a17d48e0b40df2b7dbe1 SHA-256: ec546f5758a8b8c188cf1395fea2d45e0efd2fc51fcf0bf8c99b48bd56e005b8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the extensive use of external links is a common tactic for SEO manipulation or to serve as a lure for further malicious activity.

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://bridgestreampublishing.com/uploads/1/3/0/9/130969595/130969595.html#homebrew+9%3A+1+balun
    • http://krystafry.com/uploads/1/3/0/3/130323342/bitotobuvidupowojog.pdf
    • http://sheffieldacres.com/uploads/1/3/0/5/130546237/6447312.pdf
    • http://scrocco-kelly-dialogue-portfolio.com/uploads/1/3/0/8/130814471/8212294.pdf
    • http://tcxxx.xyz/uploads/1/3/0/9/130969211/7656103.pdf
    • http://thebeaulifestyle.ca/uploads/1/3/0/7/130738735/f1bdbc358.pdf
    • http://hessfamilyeyecare.org/uploads/1/3/1/4/131437393/mefopilugam_nininusop.pdf
    • http://boomfitnesswgh.com/uploads/1/3/0/7/130740244/limugosafixi.pdf
    • http://nathanshatto.com/uploads/1/3/0/2/130288507/f6ecb8bd.pdf
    • http://toddlinginthedmv.com/uploads/1/3/0/5/130588927/6083179.pdf
    • http://ellischangeconsulting.com/uploads/1/3/0/9/130969636/dudeginefanirod_juxowijalawimir_felavazori.pdf
    • http://dvudiensten.com/uploads/1/3/0/5/130551125/lonogib-vuwemotimizifu-mejosoxuxu.pdf
    • http://housingfirstdevelopment.org/uploads/1/3/0/6/130604482/xitunamo.pdf
    • http://vitalpinc.com/uploads/1/3/0/4/130476539/4623791.pdf
    • http://npradventistacademy.org/uploads/1/3/0/6/130605019/wogupabofizi-jaganifisug.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000914c.bin
a9babc1c5c3f728c57c861194bc24fb094a9a0b405cbbbaf5f1fddff2e4ab8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x914C 8396 bytes
font_01_sfnt_off0000b19d.bin
cfb3357b20fb01955c1e4a0ed568c791e3a97db8f0fbaa18432a833eaa1d19da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB19D 2828 bytes

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