Malicious PDF — malware analysis report

Static analysis result for SHA-256 176d5d73f5208da6…

MALICIOUS

PDF

42.7 KB Created: 2020-03-24 15:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d74629df772bab31be0f5f2f28f5927 SHA-1: 414dba5e8e11e08c5d80e4f96cf7aaf257a5377e SHA-256: 176d5d73f5208da6774d32b08da5a941c18aa05a7c3aa1ed62043cf443525aba
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, a technique often used for SEO link farming or to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to 'Ejercicios resueltos metodo simplex maximizar'. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The numerous embedded URLs suggest an attempt to distribute malicious content or phish users.

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://sebastiangardner.com/uploads/1/3/0/6/130604093/130604093.html#ejercicios+resueltos+metodo+simplex+maximizar
    • http://ellieyaeger.com/uploads/1/3/0/6/130603771/243367ab459.pdf
    • http://dannyderrick.com/uploads/1/3/0/2/130288318/5ba7a4.pdf
    • http://www.michkah.com/uploads/1/3/0/7/130776035/5f36d66a28.pdf
    • http://manangkala.net/uploads/1/3/0/7/130775278/nafobinow.pdf
    • http://pdtrucking.net/uploads/1/3/0/6/130605078/bujuwosasigusajunana.pdf
    • http://dizacstickers.com/uploads/1/3/0/3/130313218/gefiditajirumobuw.pdf
    • http://justasplanned.net/uploads/1/3/0/6/130604281/8171627.pdf
    • http://thelunakit.com/uploads/1/3/0/3/130379333/7c42f108cd7379a.pdf
    • http://tarachivukula.com/uploads/1/3/0/6/130620667/zegodubisetez.pdf
    • http://progressionpropertiesllc.net/uploads/1/3/0/2/130289311/sesozebopovodapa.pdf
    • http://freeyourmindnow.org/uploads/1/3/0/4/130488445/remusedunerug_feloviji.pdf
    • http://harellbusinesssolutions.com/uploads/1/3/0/6/130621523/5048734.pdf
    • http://edermtest.com/uploads/1/3/0/5/130547771/3733698.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_off00007890.bin
e235782039383bc5bc43fa08c0c5c1426c53cc050d08c4b76936824e65c2c434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7890 9844 bytes

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