Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f871fa731089af…

MALICIOUS

PDF

40.3 KB Created: 2020-05-26 10:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: b68604bf232b15bf0a10f105632b4ccf SHA-1: c73c3b16a80f2fe2e03ddc378b000bb9f4b1d0cc SHA-256: b5f871fa731089aff3c9603e28e17646f6d5167d06b0fd0063c078ae06d4a94e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text and what appears to be a partial URL, suggesting it's not intended for direct user consumption but rather to facilitate the link farm. The primary attack pattern involves directing users to a network of potentially malicious websites.

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://dogoodentertainment.com/uploads/1/3/0/6/130621105/130621105.html#diferencia+entre+transferencia+manua PDF link annotation
    • http://hme-technology.com/uploads/1/3/0/6/130639948/8dd81d33565c5.pdfIn PDF document text
    • http://helladance.com/uploads/1/3/1/4/131438571/xizidomafu-farezovokeramak.pdfIn PDF document text
    • http://scfloft.com/uploads/1/3/1/3/131383386/sapov-mibusitobuxug-gasow.pdfIn PDF document text
    • http://xn--hjerlhedenaturlb-zxb.dk/uploads/1/3/0/6/130604088/4370157.pdfIn PDF document text
    • http://rayaneid.com/uploads/1/3/0/2/130289352/9072384.pdfIn PDF document text
    • http://distinctivehandyman.com/uploads/1/3/0/6/130604667/700649abe139.pdfIn PDF document text
    • http://reservationwise.com/uploads/1/3/0/4/130436439/larewelumag.pdfIn PDF document text
    • http://phillipsquarterhorses.com/uploads/1/3/0/7/130739944/koxugerowemuxum.pdfIn PDF document text
    • http://mta-sts.arsviva.org/uploads/1/3/0/7/130776788/dodifonulidot-rojudip-sajib-pitenonexaput.pdfIn PDF document text
    • http://windowscleanersyork.com/uploads/1/3/1/4/131438510/kenizuwaxupova-deletenamu.pdfIn PDF document text
    • http://chrystabilton.com/uploads/1/3/0/7/130776264/midit.pdfIn PDF document text
    • http://melaninart.org/uploads/1/3/0/2/130289392/9b4f1f.pdfIn PDF document text
    • http://maxilte.com/uploads/1/3/0/4/130436181/c020c43f9.pdfIn PDF document text
    • http://agapeheartint.org/uploads/1/3/1/4/131482996/9e4c1b102.pdfIn PDF document text
    • http://amyarmstrongtherapy.com/uploads/1/3/0/2/130289266/1754496.pdfIn PDF document text
    • http://seopolariswebsitesolutions.co.uk/uploads/1/3/0/4/130483512/lujularurerilow.pdfIn PDF document text
    • http://lubbocktreecare.com/uploads/1/3/0/8/130813453/tezuxazupa.pdfIn PDF document text
    • http://bodyzenfitness.com/uploads/1/3/1/4/131452869/75f0897fb.pdfIn PDF document text
    • http://backtothebread.com/uploads/1/3/0/2/130291786/e764179.pdfIn PDF document text
    • http://goalus.org/uploads/1/3/1/4/131482992/bukedur.pdfIn PDF document text
    • http://cristinaalvarez.net/uploads/1/3/0/5/130539260/7095726.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 2

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_off00007042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7042 10760 bytes
SHA-256: 694cfa198a18cfb84fb8b2b97e36e2b4a0f2455c2c47dcb20c039bdeaa914b52

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