Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcda072ea33230d…

MALICIOUS

PDF

47.6 KB Created: 2020-03-09 09:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf2ef143b3a7644c72bca72ad7df5eef SHA-1: 7e40f40426f5094bd7745618371102c6b6eadb92 SHA-256: 5fcda072ea33230ddcfe988d096452763cc0beaa85ce4f54540175871fb5f721
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The ML classifier also strongly indicated maliciousness. The embedded URLs likely lead to further malicious content or phishing pages, and the document body's obfuscated nature and the presence of URLs point towards an attempt to redirect users to potentially harmful websites.

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://webmail.gammaxiques.org/uploads/1/3/0/8/130873867/130873867.html#anemia+de+celulas+falciformes+pdf
    • http://rootholden.com/uploads/1/3/0/2/130272478/8451006.pdf
    • http://www.aquamanagementsystems.com/uploads/1/3/0/8/130813033/e1a7985446952.pdf
    • http://misterkolani.net/uploads/1/3/0/2/130270798/4733875.pdf
    • http://www.theeyeglassroom.com/uploads/1/3/0/7/130774973/tipizem.pdf
    • http://ateenagescrewup.com/uploads/1/3/0/6/130604520/pubekodibolodub_sikivibum_saliro.pdf
    • http://weboughtagun.com/uploads/1/3/0/4/130483266/538b34c6e12.pdf
    • http://zedplusconsulting.com/uploads/1/3/0/4/130475918/6a9b4bb130.pdf
    • http://tiagomasluka.com/uploads/1/3/0/6/130639662/7733334.pdf
    • http://cbbankclassic.com/uploads/1/3/0/6/130621664/1445686.pdf
    • http://freemanfillyawfoundation.org/uploads/1/3/0/4/130435962/daliv_lelevirabomubev_wujejadopez.pdf
    • http://antiinflammatorycure.com/uploads/1/3/0/6/130639960/238de6748.pdf
    • http://cpanel.stgabeschurch.com/uploads/1/3/0/5/130551287/diveliwa.pdf
    • http://mail.britishamericanpublishing.com/uploads/1/3/0/9/130969573/mufesijatulos.pdf
    • http://mikesxsstaging.net/uploads/1/3/0/2/130270746/cc5344440.pdf
    • http://imesuccess.com/uploads/1/3/0/3/130379226/jelob_mojividanozu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://medlineplus.gov/spanish/sicklecelldisease.html
    • 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_off00008fe5.bin
bdb4732ae6b2b38afaebd7cfc6453e0bf98de6761e803405986cd3001abb7215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE5 8856 bytes

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