Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6be03c75d71f40…

MALICIOUS

PDF

45.3 KB Created: 2020-05-22 12:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: b6a48afcb012c3607ad291649b782e62 SHA-1: 716b847371d9200a446bc6f464ae775a009f3745 SHA-256: fe6be03c75d71f40f4b00a58cdcf6725e9fca2ab3446200fc60a23c3e3b13edf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body text, though partially corrupted, includes the phrase 'Jehovah s witnesses letter writing' and references wkhtmltopdf, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves hosting a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ie.undesirable.us/uploads/1/3/0/7/130775734/130775734.html#jehovah+s+witnesses+letter+writing PDF link annotation
    • http://carilionwildmed.org/uploads/1/3/1/4/131406505/piful.pdfIn PDF document text
    • http://kiddw.com/uploads/1/3/0/3/130379170/gixusenonoze-kaduga-godavano.pdfIn PDF document text
    • http://chicagosharedoffice.com/uploads/1/3/1/4/131406687/43beef54.pdfIn PDF document text
    • http://dentalmarketinglocal.com/uploads/1/3/1/3/131383889/5647167.pdfIn PDF document text
    • http://angelebeaute.fr/uploads/1/3/1/0/131070710/tinemevurefobog-luratov-semused-supakitobil.pdfIn PDF document text
    • http://revueservices.com/uploads/1/3/0/8/130815080/fc4d540b1051.pdfIn PDF document text
    • http://mnccpholdings.com/uploads/1/3/0/7/130738929/8906535.pdfIn PDF document text
    • http://salonfryzjerskibella.pl/uploads/1/3/0/4/130476880/88a1c44a7.pdfIn PDF document text
    • http://laureneliseskates.com/uploads/1/3/0/7/130776314/surejevotawibafar.pdfIn PDF document text
    • http://raisingtheblues.net/uploads/1/3/0/7/130776819/f33b9228.pdfIn PDF document text
    • http://thedivineyou.us/uploads/1/3/0/5/130543212/vapatojexogu.pdfIn PDF document text
    • http://sparkcommunity.online/uploads/1/3/0/6/130605161/174706.pdfIn PDF document text
    • http://ginashiddentreasures.com/uploads/1/3/1/3/131380755/dojuduzowolux.pdfIn PDF document text
    • http://therandytravisfoundation.org/uploads/1/3/0/5/130590410/nuvobevunimap.pdfIn PDF document text
    • http://darnellduoattentivecaring.com/uploads/1/3/0/6/130640105/2953162.pdfIn PDF document text
    • http://dogsperks.com/uploads/1/3/0/2/130288554/1021195.pdfIn PDF document text
    • http://seatsandracks.com/uploads/1/3/1/4/131454549/3519490.pdfIn PDF document text
    • http://styledbyyannie.com/uploads/1/3/0/5/130551124/7251738.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000858a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x858A 10528 bytes
SHA-256: e008029fff9dc2672fbab9884b6c272eb47491692ec18000b0b6b83ed560c633

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