Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9d1851f1db74a7…

MALICIOUS

PDF

34.3 KB Created: 2020-05-21 19:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: a866acfd175d77748d421576aac7baa6 SHA-1: 5e183245753cc3a49b14c8956ffdcacf35a677ea SHA-256: af9d1851f1db74a74b8f6fd6d895ce23647f3c07e4698bb51482e5aeef0d3d4c
96 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, many of which point to similarly structured URLs on various domains. The document body, though partially corrupted, suggests a lure related to a 'Romeo and Juliet' test, likely intended to trick users into visiting these malicious sites. The ML classifier strongly indicates malicious intent.

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://twistedsugarut.com/uploads/1/3/0/2/130271078/130271078.html#romeo+and+juliet+final+test+answer+k PDF link annotation
    • http://mindfulness-et-sport.com/uploads/1/3/0/6/130621113/lonesanofamibig.pdfIn PDF document text
    • http://marketfocre.com/uploads/1/3/0/7/130740444/2957974.pdfIn PDF document text
    • http://ellensburgcanyonwinery.net/uploads/1/3/0/5/130539676/vegigugalunes.pdfIn PDF document text
    • http://seatown.social/uploads/1/3/0/5/130539241/b5215a.pdfIn PDF document text
    • http://fixinsbbq.com/uploads/1/3/0/5/130539871/8d8cc6e45.pdfIn PDF document text
    • http://kountertops.com/uploads/1/3/1/8/131871593/7879c0720863139.pdfIn PDF document text
    • http://wellnessmhc.org/uploads/1/3/2/3/132303378/943548.pdfIn PDF document text
    • http://marisolscreations.com/uploads/1/3/0/6/130621506/fca457df275.pdfIn PDF document text
    • http://mtylerjordan.com/uploads/1/3/0/6/130621210/8483bb3e1e4.pdfIn PDF document text
    • http://tag-walk-creative.com/uploads/1/3/1/6/131636761/ziriz-vakodim.pdfIn PDF document text
    • http://gwpatterns.com/uploads/1/3/0/6/130639791/97d6c8bd9f4e12f.pdfIn PDF document text
    • http://oandgconstructions.com/uploads/1/3/0/4/130476587/zetufo-vuzexaxe-gumanu.pdfIn PDF document text
    • http://cryptocashusa.com/uploads/1/3/0/6/130603744/nokixuguguzuvajed.pdfIn PDF document text
    • http://nurmontessori.org/uploads/1/3/0/5/130550683/7131571.pdfIn PDF document text
    • http://homeownersplumbingacademy.com/uploads/1/3/0/6/130622104/7584cc9250a5444.pdfIn PDF document text
    • http://sacredrootsohio.com/uploads/1/3/1/4/131483126/melaramiti-nusugobujodoluv.pdfIn PDF document text
    • http://kidperfectextreme.com/uploads/1/3/0/4/130435807/6472541.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 1

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_off00005a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A84 10328 bytes
SHA-256: 0a8ee7ca008761c578303f541fddc7a35b99bcee0d62541ab681aeb0b6c58ba5

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