Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c4afaecc9b2e76…

MALICIOUS

PDF

41.3 KB Created: 2020-03-23 11:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36e6dfd0e11cf692677b987bd49dacd0 SHA-1: 5f6e7db71cb2bc3c08182fe88b135a3762c9fc72 SHA-256: 37c4afaecc9b2e76036d091122308520839b3b7657bcb49f1f1c64bdd0df00dd
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though garbled, contains references to the URLs, suggesting a lure to external content. The primary attack pattern involves redirecting users to a link farm, likely for SEO manipulation or to serve malicious payloads.

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://carrinfotech.com/uploads/1/3/0/5/130551112/130551112.html#fisiologia+del+sistema+digestivo+de+las+aves+pdf
    • http://www.hotzapia.com/uploads/1/3/0/5/130550697/jalozetajowipa_nikisakarubonan_wifikupuvuwawe.pdf
    • http://eclaircie33.com/uploads/1/3/0/6/130603819/5064030.pdf
    • http://www.steidlelawfirm.com/uploads/1/3/0/7/130775776/dfd235a53749bd.pdf
    • http://whiteboyconstruction.com/uploads/1/3/1/0/131071137/nalon.pdf
    • http://westernjules.com/uploads/1/3/0/8/130814714/zixerosutez_midiwadixoxe_dinugejol_tumememe.pdf
    • http://johntejada.net/uploads/1/3/0/4/130483981/e6b0cf.pdf
    • http://www.funkywebsitedesigns.co.uk/uploads/1/3/0/2/130289676/pigararajetibodetun.pdf
    • http://maans.bpmtc.com/uploads/1/3/0/3/130313555/zozoxi-delarukipaxa.pdf
    • http://baudlbears.com/uploads/1/3/0/4/130476732/borutoluvol.pdf
    • http://www.sausagecorner.com/uploads/1/3/0/9/130969483/2208587.pdf
    • http://alexisborth.com/uploads/1/3/0/2/130291449/3054536.pdf
    • http://castlemusicroom.com/uploads/1/3/0/6/130603676/pawonunulelose_dodimuvem_xagimanipamogid_kedulaxedotafi.pdf
    • http://jillsamselcooper.com/uploads/1/3/0/7/130739561/65215.pdf
    • http://mx.hktda.com/uploads/1/3/0/6/130604030/lekere-monifaxopab.pdf
    • http://lanebytes.com/uploads/1/3/0/7/130740376/30796fc5a7d338.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076a1.bin
6deb18be49950e5388ab23f29f56eea23a0c376cbd5d2df9a5f7698c66c8b89c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A1 8536 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.