Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f90769e219ac47c…

MALICIOUS

PDF

34.7 KB Created: 2020-04-13 02:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 79ec822e5b2a32eb978c35e967f46480 SHA-1: c5eb1ba485859690e7d46ba08da480c2ef638330 SHA-256: 3f90769e219ac47c9e44034554ea8271d23f78a4b811dc3dab55f55e98e4b34b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains a large number of external links, many of which are dynamically generated with numeric slugs, indicating a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains references to 'holt mcdougal algebra 1 pdf', suggesting a lure to attract users searching for educational content. The embedded URLs point to various domains hosting PDF files, likely serving as a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cidab.se/uploads/1/3/0/3/130379389/130379389.html#holt+mcdougal+algebra+1+pdf PDF link annotation
    • http://wildweststeel.net/uploads/1/3/1/3/131383251/biwixevovud.pdfIn PDF document text
    • http://harmoniouslymad.com/uploads/1/3/0/3/130323277/rowojaxiku_suzunizu_medozakogawuv_xugalud.pdfIn PDF document text
    • http://mercedes.fit/uploads/1/3/0/7/130739233/e23ac2.pdfIn PDF document text
    • http://samuelboda.com/uploads/1/3/1/3/131398332/fevenujidib_fozubazetip_jasubolesez_zegarabugu.pdfIn PDF document text
    • http://paradisecream.ca/uploads/1/3/1/3/131381762/miwererulofetumi.pdfIn PDF document text
    • http://mywordsworn.com/uploads/1/3/0/4/130483295/20f744.pdfIn 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

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_off000055a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55A0 7712 bytes
SHA-256: 41fbc813877dc1257b5f34354443f7c98ee5d764482d3d325d80c65c9c5c2180
font_01_sfnt_off000073e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E3 2484 bytes
SHA-256: 0a74f62927e6506cf556ce04093ddaf717254a888a2313c4e0126ed6d6ed1ae5

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