Malicious PDF — malware analysis report

Static analysis result for SHA-256 67df65224cd02fe0…

MALICIOUS

PDF

36.7 KB Created: 2020-03-29 08:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 282cab1bd25a846f23947b8e462222d5 SHA-1: 85426ebfb7df27e5a8de3bcce8bb44fabba1e2b3 SHA-256: 67df65224cd02fe0ea974132f62b4b1539631984bab47eb61f881c8c553fb2c9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files, a technique often used for SEO spam or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://seastar.websalve.com/uploads/1/3/1/1/131164506/131164506.html#future+simple+vs+present+continuous+vs+be+going+to+exercises+pdf
    • http://activepetcare.com/uploads/1/3/0/5/130539849/papavixunipowu.pdf
    • http://www.slotcanyonk9academy.com/uploads/1/3/0/7/130776265/b2722abfb1.pdf
    • http://vitotek.ca/uploads/1/3/0/5/130539457/2335a2.pdf
    • http://homesteadharmonizers.com/uploads/1/3/0/8/130873737/wimofakupo.pdf
    • http://jennifferdiaz.net/uploads/1/3/0/6/130604993/6f1affe1f.pdf
    • http://mrsrehm.com/uploads/1/3/0/7/130776324/xikeduvap.pdf
    • http://ijoinedatconference.com/uploads/1/3/0/3/130313063/9c934.pdf
    • http://solarlandscapes.net/uploads/1/3/0/2/130271145/5266059.pdf
    • http://lilyrybar.com/uploads/1/3/0/2/130270738/4901134.pdf
    • http://cencalproperty.com/uploads/1/3/0/8/130814788/8824228.pdf
    • http://lancewhammie.com/uploads/1/3/0/5/130588716/wamujemerixi-guxosenosame-kurepanul-zepufudof.pdf
    • http://insideou.net/uploads/1/3/0/7/130776085/nudoze.pdf
    • http://cloneofaclone.com/uploads/1/3/0/5/130588157/puwemokiko.pdf
    • http://2401cedarspringsmarketing.com/uploads/1/3/0/7/130739280/c331e2.pdf
    • http://jbeautyco.com/uploads/1/3/0/4/130476085/9036101.pdf
    • http://andreasclothing.com/uploads/1/3/0/5/130552053/kipepek-someji-dotufofinejime.pdf
    • http://assetcontrolsolutions.org/uploads/1/3/1/0/131069893/dda4a1.pdf
    • http://comercializadoraexpedita.com/uploads/1/3/0/9/130968958/gazelilogader_dibovip.pdf
    • http://privateguideistanbul.com/uploads/1/3/0/4/130489803/81e6ce321.pdf
    • http://hostmaster.tamanuaustralia.com.au/uploads/1/3/0/4/130435777/kibizosabi.pdf
    • http://betterwiththebible.com/uploads/1/3/0/6/130603756/f2d4a8.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_off000064f4.bin
3c9df4bfce9a42b8745f714710471692697ebc7dc0cf67be80490d35d79de78d
pdf-font-stream PDF embedded font (sfnt) at offset 0x64F4 7492 bytes