Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4836f8873942e04…

MALICIOUS

PDF

41.3 KB Created: 2020-04-07 04:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a5109016f53e8aceb64d04039ec123f5 SHA-1: f9deab4c9937143f5febd55d259066328c884209 SHA-256: d4836f8873942e0450f09734d7af6f443eed46306d74ebe202f86e29c7bb9818
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDF documents. This technique is often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links reinforces this assessment.

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://livemindful.space/uploads/1/3/0/4/130476130/130476130.html#vicios+de+diccion+arcaismo PDF link annotation
    • http://theraindropper.com/uploads/1/3/1/0/131070307/d54d6d98c73.pdfIn PDF document text
    • http://blackpansybakery.com/uploads/1/3/0/5/130590673/gosafomipixol.pdfIn PDF document text
    • http://leashcandy.shop/uploads/1/3/0/5/130544447/lapokadeton_fezanupapi_dimonom_sefomekilefur.pdfIn PDF document text
    • http://homefrontinvestingllc.net/uploads/1/3/1/1/131164295/zunokefoja.pdfIn PDF document text
    • http://adrenalineaplified.com/uploads/1/3/0/4/130483940/pewituvukeji-rizaxorokira-nivivok.pdfIn PDF document text
    • http://74-123-78-154.mgwnet.com/uploads/1/3/0/7/130776133/kaxej-jarulufug-siraso-pemonadakepop.pdfIn PDF document text
    • http://barnbrosshop.com/uploads/1/3/1/1/131164180/2455c420335.pdfIn PDF document text
    • http://zombieapocalypsegroup.com/uploads/1/3/1/1/131164260/1904486.pdfIn PDF document text
    • http://carolinegadsby.com/uploads/1/3/1/3/131398231/ad3224b6.pdfIn PDF document text
    • http://atlanticplumbinggroup.com/uploads/1/3/0/7/130775527/9d98b7d514.pdfIn PDF document text
    • http://abbepsychservices.com/uploads/1/3/0/4/130476496/kurojivasexo.pdfIn PDF document text
    • http://mx.sunkissedgoldens.com/uploads/1/3/0/4/130435955/503c8c.pdfIn PDF document text
    • http://skilledusa.org/uploads/1/3/0/4/130477135/romutikat.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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7F 8576 bytes
SHA-256: 02a4803b4a0f2d7e320ad9ea59cac5b9228c2fd8625b543e355376756a2a14ca
font_01_sfnt_off00008cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAC 2652 bytes
SHA-256: e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea

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