Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d4a16f77adecff…

MALICIOUS

PDF

43.4 KB Created: 2020-04-19 01:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2ce706fb897782af741a9e92db0170e6 SHA-1: ef538edc1f892f5663ca3fe04ad91ed131f5fd5d SHA-256: 38d4a16f77adecff1f0f70211cb8430b7b0ec6557b25cb13c5bcd1d0ba09e718
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to unrelated domains and appear to be part of a link farm. The document body, though partially corrupted, suggests a lure related to a baby's first year. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://svensktspel.se/uploads/1/3/0/6/130639282/130639282.html#guide+to+your+baby%27+s+first+year
    • http://abigailfreemankarin.com/uploads/1/3/1/4/131453630/zafomokololep_novizo.pdf
    • http://eduseguridadprivada.org/uploads/1/3/0/6/130604179/179361.pdf
    • http://jennybackeberg.com/uploads/1/3/0/4/130483402/gukoserepi_bixilupebexen.pdf
    • http://peace-walk.com/uploads/1/3/0/7/130776841/pefipuvuto.pdf
    • http://eufrasiajewels.eu/uploads/1/3/0/2/130288559/b5fbd8500a27a5d.pdf
    • http://548sunnyvaledr.com/uploads/1/3/0/3/130379485/zatukusuwesasoroje.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_off0000826f.bin
319dbd13bfef7b9fd8c6cd941a4907585e7fdad2344877b232819529b099845a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x826F 8252 bytes

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