Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2d8cacfa2bc2ff…

MALICIOUS

PDF

58.4 KB Created: 2020-04-07 04:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f379be3c031ca18e79303ecec53999e9 SHA-1: d9b77ac9e4385be1a38d8104e8590d0b9d1a49ac SHA-256: df2d8cacfa2bc2ff19d8b15d918117d55d821b660808db88a83842f535470b9e
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. The document body text is largely unreadable due to encoding issues but contains fragments related to manufacturing tools and the wkhtmltopdf application.

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://nerdnurse.net/uploads/1/3/1/0/131069808/131069808.html#herramientas+de+corte+procesos+de+fabricacion
    • http://nerdfellas.com/uploads/1/3/0/2/130287291/3261445.pdf
    • http://aprilwinnvaughn.com/uploads/1/3/0/2/130272548/61068.pdf
    • http://floridanewbuildhomes.com/uploads/1/3/0/3/130324357/zuzivadotezobutalese.pdf
    • http://jumpstartbuildingcommissioning.com/uploads/1/3/0/7/130739074/pupinud-ninaforeto-wabewa.pdf
    • http://spamgw.kurath.ch/uploads/1/3/0/8/130873728/20acf.pdf
    • http://allureexclusive.com/uploads/1/3/0/5/130544672/kufupepatolesif.pdf
    • http://usbizassist.com/uploads/1/3/1/4/131437774/mizugige_pevuxebubebaxir.pdf
    • http://hell2heaven.com/uploads/1/3/0/6/130604758/godar.pdf
    • http://dachrisevents.com/uploads/1/3/0/6/130621555/birege_gonubalavomevot_pakosenu.pdf
    • http://bfbc-moshi.org/uploads/1/3/1/4/131438207/turivowoxagulo_nulonipupoxogu_napuvu_vakutit.pdf
    • http://lets-split.com/uploads/1/3/0/5/130589099/wodemovu.pdf
    • http://basicboekhouding.nl/uploads/1/3/0/6/130639982/kuxusibig_fesujalaxutasag_kulixegosatapi_sibatumosi.pdf
    • http://foyntonsberg.no/uploads/1/3/0/4/130488691/bobiluju.pdf
    • http://uncannyvalleys.com/uploads/1/3/0/7/130775893/rudojuvurimum.pdf
    • http://saukrapidsbaseball.org/uploads/1/3/0/6/130639613/netugexesaru.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_off0000b85b.bin
d7660dd426393ae77bcef234b54780b310316a40eefa684f305e8eb8c968d60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB85B 9368 bytes

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