Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a3511f50830f0b…

MALICIOUS

PDF

42.6 KB Created: 2020-04-01 16:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 82b88aa2482fc6628ab54bacb6603718 SHA-1: 1fffb677ac6f0e2b08b99110e336876d66ef87b4 SHA-256: 13a3511f50830f0b74388b184da4d50108b03b07998a263f010072851abe46c4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains a reference to 'Basketball weight training program pdf' and includes the authoring application 'wkhtmltopdf', suggesting it was generated programmatically. The primary attack pattern appears to be SEO manipulation or directing users to potentially malicious content hosted on numerous domains.

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://tkbcleaningservices.com/uploads/1/3/0/2/130289719/130289719.html#basketball+weight+training+program+pdf
    • http://f8thdesigncups.com/uploads/1/3/0/2/130292014/2133073.pdf
    • http://samanthaanncandleco.com/uploads/1/3/1/4/131409926/9687011.pdf
    • http://prettyappblog.com/uploads/1/3/0/6/130620511/d98018.pdf
    • http://yummiechubbies.com/uploads/1/3/0/6/130603745/vubekedururebeji.pdf
    • http://haddarasales.com/uploads/1/3/0/6/130640039/zozivazete.pdf
    • http://30wallst.com/uploads/1/3/0/4/130488282/lefujil-kurafijuxazow-radog.pdf
    • http://mx.chrv.at/uploads/1/3/0/5/130540437/8072991.pdf
    • http://classiccityfirewood.com/uploads/1/3/0/8/130814666/731e700d9e2ced0.pdf
    • http://al-qalamproject.org/uploads/1/3/0/3/130323596/negiwojimu_letijo_tiwufo_kanazo.pdf
    • http://terryjohnson.studio/uploads/1/3/0/8/130814479/nagebamubijamef_vanolisebor.pdf
    • http://centralparcknyc.xyz/uploads/1/3/0/8/130874601/38a615fe1.pdf
    • http://transportedepianosymudanza.com/uploads/1/3/0/6/130639613/72b24c.pdf
    • http://inspiringteesandmore.com/uploads/1/3/0/4/130488288/6895363.pdf
    • http://csbcorner.com/uploads/1/3/1/4/131408397/8225857.pdf
    • http://blobfishbooks.com/uploads/1/3/0/2/130289344/sugonujinokama_basodebuj_wosevid_xesisogoz.pdf
    • http://tesoltime.com/uploads/1/3/0/8/130814189/kizesikitujoz_zepogopufin_rulutil.pdf
    • http://core.vitevite.biz/uploads/1/3/0/6/130621082/e97cda1c.pdf
    • http://njstrengthcamp.com/uploads/1/3/0/9/130969526/1092622.pdf
    • http://gratefulacres.net/uploads/1/3/0/7/130738631/98a50f5fb.pdf
    • http://josephcua.com/uploads/1/3/0/6/130604102/4920551.pdf
    • http://wendywangauthor.com/uploads/1/3/0/4/130489172/buroropaxazupo.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_off00007da0.bin
2d5407c99e739966057202623522684f28d9ebf675c88dd6ff182499b82280ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA0 7960 bytes