Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8160e8adf2f5489…

MALICIOUS

PDF

35.8 KB Created: 2020-05-24 09:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 0280b2f0038b9454619ce5d1d4664fe1 SHA-1: e570187e8cbf24e14d6bd7ef0a2cfb2b4af3d6f7 SHA-256: d8160e8adf2f5489ea431f3735c8f49157ce760007c4b1c592c84c7ec283486b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. This suggests the document's primary purpose is to act as a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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://puredentfamilycenter.org/uploads/1/3/0/8/130874620/130874620.html#spellslinger+guide+pathfinder PDF link annotation
    • http://ecolifestylist.com/uploads/1/3/1/3/131381332/nipovotito.pdfIn PDF document text
    • http://takethetonic.com/uploads/1/3/1/3/131381204/zatigizotor-dumedapivovik-duzitudesena.pdfIn PDF document text
    • http://litterboxharmony.com/uploads/1/3/0/7/130739150/gazetuwakuv_vetarolapigas_karoxarugeras_xotutobo.pdfIn PDF document text
    • http://concordlightopera.com/uploads/1/3/0/7/130738501/sufenularabi_vopotid.pdfIn PDF document text
    • http://caesarclothingco.com/uploads/1/3/0/4/130483489/konetalajo-redanikeri.pdfIn PDF document text
    • http://ifccoahing.com/uploads/1/3/1/0/131070401/memuzegiw_tajax.pdfIn PDF document text
    • http://crittendenrefwest.com/uploads/1/3/0/2/130272389/zidejamutipi_xavovuju.pdfIn PDF document text
    • http://desnurkwinkel.com/uploads/1/3/0/5/130543272/bimejaji.pdfIn PDF document text
    • http://soulredemption808.com/uploads/1/3/0/2/130288673/916da0b7856cd.pdfIn PDF document text
    • http://generations-online.com/uploads/1/3/0/5/130539497/nuvekujuzimuziwi.pdfIn PDF document text
    • http://mariamesnitsari.com/uploads/1/3/0/7/130738625/cce5a7a.pdfIn PDF document text
    • http://brasstackspersonalstyling.com/uploads/1/3/1/3/131383544/kilezam.pdfIn PDF document text
    • http://renray.net/uploads/1/3/0/5/130588708/vodoxemipeb.pdfIn PDF document text
    • http://russellswell.com/uploads/1/3/0/7/130739260/gobemabidapog.pdfIn PDF document text
    • http://pethousemagazine.com/uploads/1/3/0/6/130621683/4970720.pdfIn PDF document text
    • http://lajcccf.org/uploads/1/3/1/8/131857204/6391dc5.pdfIn PDF document text
    • http://southmanxtremetriathlon.com/uploads/1/3/0/6/130621583/xodogufe-rozalowafoma-musimebavowo.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 3

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_off00005f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 10456 bytes
SHA-256: cc9aeb2dc37533e54faf60a3631c2812eb39d4c0c7d9e5e444ec92772275dfe0

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