Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d51f3ffd9815f94…

MALICIOUS

PDF

51.6 KB Created: 2020-03-29 10:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: bfa7f0a85bad2135792b551c8ca5a232 SHA-1: 5f7a239d8cfaede00f22a7bc1b9944cb134994b2 SHA-256: 7d51f3ffd9815f94624a2d9b367f9c26ff2a130fdc4327381d2e8a952eff2127
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the presence of numerous external URLs and the ML classifier's high confidence indicate malicious intent, likely related to distributing further malware or engaging in SEO spam. The document body itself is heavily obfuscated and contains embedded URLs.

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://lists.accordionapocalypse.com/uploads/1/3/0/5/130550679/130550679.html#diagrama+de+fuerza+axial+en+barras PDF link annotation
    • http://www.tattoosbyaross.org/uploads/1/3/0/4/130483817/paxapu_kifaxe_vitiminili.pdfIn PDF document text
    • http://atwi80d.com/uploads/1/3/0/5/130541384/rotazosa-vokevumupi.pdfIn PDF document text
    • http://tejontech.com/uploads/1/3/0/2/130287521/4194984.pdfIn PDF document text
    • http://n2itinteractive.com/uploads/1/3/0/6/130605406/7338886.pdfIn PDF document text
    • http://www.bluepalmdiscounts.com/uploads/1/3/0/6/130639024/89e7f7197b.pdfIn PDF document text
    • http://webdisk.startatravelbusiness.com/uploads/1/3/0/6/130639404/napew.pdfIn PDF document text
    • http://mta-sts.mail.kenyeung.org/uploads/1/3/0/6/130639607/ec8dceb17ad3b.pdfIn PDF document text
    • http://nutrimoda.com/uploads/1/3/0/5/130590361/nawebemop_zijulimunibisud.pdfIn PDF document text
    • http://www.blackcardu.stefanaarnio.com/uploads/1/3/0/6/130604502/c59b00d3eb275e.pdfIn PDF document text
    • http://docuprosynch.com/uploads/1/3/0/4/130489359/wufexuk.pdfIn PDF document text
    • http://www.missouriphilharmonic.org/uploads/1/3/0/8/130814553/xatezidow.pdfIn PDF document text
    • http://www.thechildrenscottagefortmill.com/uploads/1/3/0/5/130590169/zakojejas-jirubizufoz.pdfIn PDF document text
    • http://thebreastfeedingdoula.com/uploads/1/3/0/4/130435532/37bb054103.pdfIn PDF document text
    • http://adifferentbook.com/uploads/1/3/0/8/130874613/6121323d6.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2F 9508 bytes
SHA-256: 36d41d4eb3340aa42153b7a31f60ee1384895b6f06cfd7db7f5a0823864e87d2
font_01_sfnt_off00009d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D66 3252 bytes
SHA-256: c3aedad773dac8a4db1bdc6a1b68aead5a6ecb4965e10d564dc282355e407b36
font_02_sfnt_off0000a8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8CF 16520 bytes
SHA-256: c1ab5f3f6c5e8549e8e6b279a4a221cb386785e0c276503ef1c4f156609eba46

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