Malicious PDF — malware analysis report

Static analysis result for SHA-256 922ff0c178c3cff9…

MALICIOUS

PDF

44.6 KB Created: 2020-04-03 13:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 155fb18202ba0e2ddb802d5799aefcc5 SHA-1: c1f336310e99418684da6916fd0bde6547a657a3 SHA-256: 922ff0c178c3cff9d4a37b79e64659cb38a0c8c1d56350c3552f1719285602a8
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, forming a link farm. The primary URL points to a page with exercises, but the majority of the links lead to other PDF files on various domains, suggesting a SEO spam or redirection tactic. The ML classifier strongly indicated maliciousness, supporting the interpretation of this link farm as a malicious distribution or redirection mechanism.

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://islamophoria.com/uploads/1/3/1/0/131070279/131070279.html#ejercicios+para+abdominales+y+piernas
    • http://clockworkcatdesigns.com/uploads/1/3/0/7/130739297/repajoler-nitibuvam-zaxijosanaw.pdf
    • http://nude-portraits.com/uploads/1/3/1/4/131452961/c9b6664f2.pdf
    • http://cbd2door.shop/uploads/1/3/0/3/130323647/lidonotom.pdf
    • http://powell-river-sd47-intl-edu.com/uploads/1/3/0/5/130588586/mazuwo.pdf
    • http://legacyfellowship.net/uploads/1/3/1/3/131398504/551ff01fe39debc.pdf
    • http://lizrnewman.net/uploads/1/3/0/6/130639592/lekebat.pdf
    • http://ishasushi.com/uploads/1/3/0/5/130547624/fudirorubu.pdf
    • http://morestyle.com.au/uploads/1/3/1/4/131438604/7189768.pdf
    • http://madamemodica.com/uploads/1/3/0/2/130292014/f528a52.pdf
    • http://partingshotphotography.com/uploads/1/3/0/7/130739648/tigorenimukonugamo.pdf
    • http://beingmadewholeblog.com/uploads/1/3/0/6/130605176/jewatexibulabutegas.pdf
    • http://silverhandpickups.com/uploads/1/3/0/7/130775980/falex.pdf
    • http://karinmoser.com/uploads/1/3/1/3/131383665/dojudewug-sumokinot-gibodibetok.pdf
    • http://ellewells.com/uploads/1/3/0/6/130604458/pepofizi.pdf
    • http://doyouhaverland.org/uploads/1/3/0/5/130543020/suwuvunazaku.pdf
    • http://brothersnblue.com/uploads/1/3/0/3/130323967/ridivojutawubad-kobexirupefa.pdf
    • http://nasumo.com/uploads/1/3/0/7/130740084/xuxekinubev.pdf
    • http://james-ma.com/uploads/1/3/0/6/130604151/611014.pdf
    • http://angiecoxcounseling.com/uploads/1/3/0/2/130287278/5592305.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_off0000841d.bin
70949e3305ef70a231af598555cb4a452630fe56c4ca4546f738ea9edfc95604
pdf-font-stream PDF embedded font (sfnt) at offset 0x841D 8488 bytes