Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0090a02a390206…

MALICIOUS

PDF

35.1 KB Created: 2020-05-13 14:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1912c0603f14584e6640f726a33addc8 SHA-1: 29ca664716e1ba8e3e7c86b527073890e4272c3e SHA-256: 2d0090a02a3902063288e5c46865973ab22215a3b0bf438c589bf325311cf999
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to SEO-optimized PDF files. The document body text, though partially corrupted, mentions 'Best dictionary app for android quora', suggesting a lure to a fake app or phishing site. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates a likely SEO spam or phishing campaign.

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://colordalefarms.com/uploads/1/3/1/3/131380627/131380627.html#best+dictionary+app+for+android+quora
    • http://sienaacademy.org/uploads/1/3/1/6/131637291/bomatawopixin.pdf
    • http://systemize.accountant/uploads/1/3/0/9/130969563/9924398.pdf
    • http://humanrightsekb.ru/uploads/1/3/0/4/130483260/palaxe.pdf
    • http://zamorayogawellnessretreats.net/uploads/1/3/1/4/131453393/gorododivaro.pdf
    • http://rcelectrics.com/uploads/1/3/0/2/130289417/jikobadago.pdf
    • http://tulsicare.com/uploads/1/3/0/7/130776340/fikazinomurofubizo.pdf
    • http://phdla-blog.com/uploads/1/3/1/3/131398197/remukana-bezufijadawelom.pdf
    • http://konsciousness.org/uploads/1/3/1/4/131453041/37dd5b82be.pdf
    • http://shootingo.com/uploads/1/3/1/3/131380547/3b0c9d26c65093.pdf
    • http://stephaniesstoragesale.com/uploads/1/3/0/3/130313400/gumatog.pdf
    • http://centrodanzalauracolombo.com/uploads/1/3/0/2/130288318/gowapepoki.pdf
    • http://themshop.us/uploads/1/3/0/6/130603767/6106700.pdf
    • http://morrison-square.com/uploads/1/3/0/7/130739974/0677deb71c.pdf
    • http://orchardlanguageschool.com/uploads/1/3/0/5/130551202/dibisezatejoz-fijiki.pdf
    • http://telsaelectricfestival.com/uploads/1/3/0/4/130489039/ada9df2.pdf
    • http://anilpatrickpatel.com/uploads/1/3/0/6/130604524/3ac677a2225e.pdf
    • http://onlinepropertylawyer.com/uploads/1/3/0/2/130289541/3077021.pdf
    • http://danahoitartroom.com/uploads/1/3/0/8/130874146/51905f.pdf
    • http://luukvandeweghe.com/uploads/1/3/1/4/131452753/930771aec6cef.pdf
    • http://danahoitartroom.com/uploa
    • 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_off00005fd5.bin
d9e31baf9d783708a8d3265299a6450eccdf7fce6f193994b948f1b7815ace9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD5 9536 bytes

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