Malicious PDF — malware analysis report

Static analysis result for SHA-256 f883dbd37932f22e…

MALICIOUS

PDF

52.2 KB Created: 2020-03-17 16:19:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 91c6fb7d7dac2f4aee2b789f78b3d6ba SHA-1: a0625fa96809efd8bf5a0b193703d64b227ab19c SHA-256: f883dbd37932f22e5b9fe390b5acc51fa740048a4345d0eb84ba3939332bafff
96 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing a large number of external URLs pointing to other PDF files hosted on various domains. The primary heuristic indicates a 'PDF_SEO_LINK_FARM' with 28 external links, suggesting an attempt to manipulate search engine results or distribute content through a wide network of sites. The document body contains a title related to algebraic language examples, which appears to be a lure to mask the true malicious intent. No scripts were extracted, and the attack relies solely on the embedded links.

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://shiying-cheng.com/uploads/1/3/0/4/130489771/130489771.html#10+ejemplos+de+lenguaje+algebraico+resueltos PDF link annotation
    • http://privasack.com/uploads/1/3/0/4/130492441/kojupetufewuzozodot.pdfIn PDF document text
    • http://www.teresasmusz.com/uploads/1/3/0/6/130620694/povegogevomasot.pdfIn PDF document text
    • http://teamqcanadakorea.com/uploads/1/3/0/2/130288887/8730994.pdfIn PDF document text
    • http://medhealthplus.org/uploads/1/3/0/7/130739132/3908555.pdfIn PDF document text
    • http://microblading-amsterdam.com/uploads/1/3/0/5/130590036/pawitivetakuk-tekisotirorare.pdfIn PDF document text
    • http://rightformation.com.au/uploads/1/3/0/7/130776220/dupovatitikunam-zelujutigudelik.pdfIn PDF document text
    • http://inhalebeauty.net/uploads/1/3/0/6/130622091/3069805.pdfIn PDF document text
    • http://ninaceledonio.com/uploads/1/3/0/7/130776676/7990511.pdfIn PDF document text
    • http://mta-sts.mx.hautetotssale.com/uploads/1/3/0/3/130324248/kadelomu-zigorizukonemi-pumefubi.pdfIn PDF document text
    • http://hostmaster.wearebones.com/uploads/1/3/0/3/130323130/nukiwoxoguvuris.pdfIn PDF document text
    • http://mta-sts.mail.ulcberkeley.org/uploads/1/3/0/6/130620519/3415871.pdfIn PDF document text
    • http://daciajones.com/uploads/1/3/1/0/131070799/jopobibobi.pdfIn PDF document text
    • http://cpanel.chicomcrooster.com/uploads/1/3/0/4/130491253/8848206.pdfIn PDF document text
    • http://kunzeartgallery.com/uploads/1/3/0/4/130490378/981169.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 2

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_off00007f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F08 9664 bytes
SHA-256: 6acd3d9f490e725b0f81bc2dc4189035838b0119f35d44dbea8a7c4836df4b46
font_01_sfnt_off0000a1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1E5 2620 bytes
SHA-256: 653dc20d180e009c59d990c99cfb3464f73b40b8603e8d23d2ab1c46501aac7f
font_02_sfnt_off0000ab27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB27 16308 bytes
SHA-256: db3fab1190ca5052c46382a0b6a69411917a09efc96d46655998868c2a0448a1

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