Malicious PDF — malware analysis report

Static analysis result for SHA-256 24163cc1176f3ad0…

MALICIOUS

PDF

37.0 KB Created: 2020-04-08 15:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f19f38d219afb8d58815c4f3b826c31e SHA-1: 33c8a53edb09ac963282c1514d8d96a90268fa71 SHA-256: 24163cc1176f3ad02b433c755b8007148eb5fb617cf6c14681db6c93cd208203
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous external links to other PDF documents hosted on various domains. The primary lure appears to be related to 'Logitech ipad air 2 keyboard how to connect', suggesting a phishing or spamming attempt. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass link farm designed to manipulate search engine results or distribute spam.

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://designproinnovation.com/uploads/1/3/0/8/130814471/130814471.html#logitech+ipad+air+2+keyboard+how+to+connect
    • http://runsquadopo.org/uploads/1/3/1/1/131163514/ruwoxexagev_fadetorigejug.pdf
    • http://gordoncraigcpa.com/uploads/1/3/1/4/131406806/zebafiwidiwowe.pdf
    • http://plumbercrestviewfl.com/uploads/1/3/1/4/131409210/202bfcfaefdc.pdf
    • http://jbkeysystems.com/uploads/1/3/0/5/130540077/taronarewe.pdf
    • http://accommodatingactivities.com/uploads/1/3/1/4/131453081/zuvarivapaja-bapawuzaluzerew.pdf
    • http://collectiveworx.com/uploads/1/3/0/2/130287866/5703959.pdf
    • http://sittingtreefarm.com/uploads/1/3/0/4/130436190/0f655a6.pdf
    • http://mrsofteesouthflorida.com/uploads/1/3/0/6/130603989/1b0e9940.pdf
    • http://aedutah.com/uploads/1/3/0/8/130814681/nulovadekoral.pdf
    • http://leaitani.net/uploads/1/3/0/6/130621244/gidixovabaxu.pdf
    • http://seasidepaws.pet/uploads/1/3/1/4/131406149/lipalobojafot.pdf
    • http://wemisstheearth.org/uploads/1/3/1/4/131453734/7522671.pdf
    • http://triodejaneiro.nl/uploads/1/3/0/6/130604767/8c96d1ef5.pdf
    • http://returnoninitiative.us/uploads/1/3/0/5/130551013/2109000.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_off0000660d.bin
de28c7b7b292af69d21d6eb719fcd6e36c87c543e14a98eecb4a8ed6560fe21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660D 8508 bytes

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