Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5ef03d556cd6be…

MALICIOUS

PDF

48.7 KB Created: 2020-03-23 11:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e09fe3decaac79f253dc2afb3c4ac6fe SHA-1: 6222774bb748538f496eb0bbfa26be19fe550e86 SHA-256: db5ef03d556cd6be21c16d13eb278a3a1a1cbfb17ce898917102bb603e4d1cde
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The 'PDF_SEO_LINK_FARM' heuristic firing indicates a mass of external links, and the ML classifier strongly suggests malicious intent. The document body, though partially corrupted, contains text related to unit conversion, which serves as a lure to disguise the malicious nature of the links.

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://clucktruckportland.com/uploads/1/3/0/8/130874642/130874642.html#unidades+de+area+conversor
    • http://unhappycamperstudios.com/uploads/1/3/0/3/130313356/991108.pdf
    • http://sugas.org/uploads/1/3/0/5/130540072/5136768.pdf
    • http://educationalconsultant.ca/uploads/1/3/0/3/130323491/b2249.pdf
    • http://webmail.maderakubo.com/uploads/1/3/0/9/130969623/kananefawex.pdf
    • http://jaynievelasquez.com/uploads/1/3/0/9/130969238/zilerutarinovor.pdf
    • http://tcsoutheastbaseball.com/uploads/1/3/0/5/130538995/xevibofog.pdf
    • http://www.jchohlstern.com/uploads/1/3/0/6/130604543/eec334896855c.pdf
    • http://sorrentospringsequity.com/uploads/1/3/0/6/130639837/98ceb21033fd4.pdf
    • http://theempoweredyou.com/uploads/1/3/0/7/130739267/3311283.pdf
    • http://neneighborz.org/uploads/1/3/0/7/130740199/xepilugabavu-mozajisarud-xapunetik-kefevawa.pdf
    • http://fourlegsofwellness.com/uploads/1/3/0/6/130639445/dakuluzodi.pdf
    • http://aquaskymedia.com/uploads/1/3/0/4/130483606/833989.pdf
    • http://richmontoya.com/uploads/1/3/0/8/130814297/7496978.pdf
    • http://prinseshaar.site/uploads/1/3/0/3/130313086/2609538.pdf
    • http://lasinrival.net/uploads/1/3/0/4/130489102/6260132.pdf
    • http://derekleebarton.com/uploads/1/3/0/2/130270990/736546.pdf
    • http://juntspercastelldefels.cat/uploads/1/3/0/4/130436402/kokufomilez.pdf
    • http://newwebsite2017aug.com/uploads/1/3/0/2/130270823/812063.pdf
    • http://chestnutsholidays.com/uploads/1/3/0/5/130588693/e741fffcb6.pdf
    • http://pancakehowto.com/uploads/1/3/0/6/130639801/8472863.pdf
    • http://nchi.shop/uploads/1/3/0/4/130483158/fusowav_gedofud_vufapelinojima.pdf
    • http://dces9.salon225.com/uploads/1/3/0/4/130489149/nomuvedud-toregob.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007af4.bin
8c57e69d3ae11fceb2c4b79b8b256ae0bdf07effcb50669f160847fbab876f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF4 10520 bytes
font_01_sfnt_off00009df5.bin
42fec308b7cab2f393414e9bdc1a6bd25b4aa0b9070acde390e3b63ffb91afd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DF5 16100 bytes

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