Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1688e6e72b9e70…

MALICIOUS

PDF

47.3 KB Created: 2020-03-26 02:32:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a73487fbde99a0cf0fb5902556af7ae4 SHA-1: 6f13fdafede4af99d41e507693779a39355a00ee SHA-256: ac1688e6e72b9e709c45a20e9304bd94297fff6abc8991c6689636ffacbd8fea
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

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://retroskoda.com/uploads/1/3/0/4/130436252/130436252.html#configuracion+electronica+del+cobalto PDF link annotation
    • http://dwmfoundation.org/uploads/1/3/0/7/130775630/6232330.pdfIn PDF document text
    • http://haroldhopkinson.com/uploads/1/3/0/4/130435895/zarejisego_mopivefugaluk_tenegeko.pdfIn PDF document text
    • http://herononline.net/uploads/1/3/0/6/130620217/lolotiko.pdfIn PDF document text
    • http://picocita.com/uploads/1/3/0/4/130477009/1597726.pdfIn PDF document text
    • http://jawphysio-perth.com.au/uploads/1/3/0/2/130272438/5273524.pdfIn PDF document text
    • http://maxenergysolutions.com/uploads/1/3/0/4/130489241/pozirobenajebo-bujivitufij-batufowe.pdfIn PDF document text
    • http://thermalinterrupt.com/uploads/1/3/0/2/130272606/gajaxojesemibake.pdfIn PDF document text
    • http://www.inspirecoders.net/uploads/1/3/0/8/130814229/lovofimeraxif-vusaf-nigomusazoz.pdfIn PDF document text
    • http://domoliseo.com/uploads/1/3/0/4/130477661/bakomage_kimuniwafap_lunonuzusetisuv_doripebitimu.pdfIn PDF document text
    • http://casagaia.net/uploads/1/3/1/0/131070332/a8fffbc59fe.pdfIn PDF document text
    • http://pmpclones.com/uploads/1/3/0/5/130539255/poxufu_mekawozubon_nuwuvugivagew.pdfIn PDF document text
    • http://thebpstation.com/uploads/1/3/0/2/130287875/lepozegepis-pojonotoge.pdfIn PDF document text
    • http://gabrielagower.com/uploads/1/3/0/3/130379065/mamuvuwiruzef.pdfIn PDF document text
    • http://noon2moon.com/uploads/1/3/0/6/130603709/8936497.pdfIn PDF document text
    • http://www.bevilleflighttraining.com/uploads/1/3/0/6/130639438/kiludoziza_lebubexutuvepi_noxokolekezo_viwije.pdfIn PDF document text
    • http://iandavidwallfantasyauthor.com/uploads/1/3/0/7/130739016/fidasujakodas_sajipepobet_mufilurutij_tilokigagowa.pdfIn PDF document text
    • http://ketoboxie.com/uploads/1/3/0/7/130740391/motivufina_parizomumomiku_niduresu_sawusazoze.pdfIn PDF document text
    • http://nackaboss.fr/uploads/1/3/0/2/130272606/rarawaguridedusobir.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_off00007025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7025 8392 bytes
SHA-256: 5ee23f4e9b31a98298d5f28f70293c8326ff11dbb8c757bd74928ee88b4760b1
font_01_sfnt_off00008f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0B 2652 bytes
SHA-256: e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea
font_02_sfnt_off00009874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9874 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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