Malicious PDF — malware analysis report

Static analysis result for SHA-256 751f1d51a2368815…

MALICIOUS

PDF

37.9 KB Created: 2020-03-25 03:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 28d6b0f6bcbdbcf08236d8b793167912 SHA-1: 2d03aee982a348da939bc6481fb18141b266aac6 SHA-256: 751f1d51a2368815296ec21103e8ea492f0389a8a0d7a51811195859847e4fb8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a mass of external links, identified as a PDF_SEO_LINK_FARM heuristic. The embedded document body text, though partially corrupted, contains references to media and statistical formulas, suggesting a lure. The primary attack pattern involves redirecting users to numerous external URLs, likely to host malicious content or engage in SEO spam. No scripts were extracted from this sample.

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://minnesotahydrographics.com/uploads/1/3/0/8/130814197/130814197.html#media+geometrica+formula+estad%C3%ADstica
    • http://www.songson.com/uploads/1/3/0/2/130289436/wezibomakopule-fajavajozo.pdf
    • http://cecilyeiferle.com/uploads/1/3/0/5/130539659/3e2591a760264.pdf
    • http://misscarolsartintheattic.com/uploads/1/3/0/6/130605030/fibegobokadaduzeme.pdf
    • http://reptilesonthemove.greatwebsitebuilder.com/uploads/1/3/0/6/130640029/kugufogo.pdf
    • http://desskuytuch.com/uploads/1/3/0/5/130546717/8524517.pdf
    • http://www.atelier-de-couturelp.com/uploads/1/3/0/7/130775470/2554994.pdf
    • http://ejdg.org/uploads/1/3/0/6/130605283/kapifivarurokarumon.pdf
    • http://thehclf.org/uploads/1/3/0/7/130738846/737558.pdf
    • http://callahair.com/uploads/1/3/0/7/130775046/5217b.pdf
    • http://10dayfilm.org/uploads/1/3/0/7/130738988/653b866fd9ff0.pdf
    • http://myhandyhomeplan.com/uploads/1/3/0/3/130313404/rizepetosaxa.pdf
    • http://grannyfarkel.com/uploads/1/3/0/8/130873790/faxiga-kalev-kilij-xasojuwozol.pdf
    • http://jfjung.com/uploads/1/3/0/3/130379314/2951621.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_off000066ca.bin
eafb10ff7ca2fbd1dc57ef9ede16dce90fb45b764bdbe8e038d6cf16fb1d3c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CA 9096 bytes

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