Malicious PDF — malware analysis report

Static analysis result for SHA-256 65111dbbb9df2c25…

MALICIOUS

PDF

40.3 KB Created: 2020-03-20 07:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f0bd3354de0602d492ae43e739b1fa2b SHA-1: 0786375c02ea767866d55d9d16365840f5224abc SHA-256: 65111dbbb9df2c250d3ec0dbceea6af55feae7a1f1c1ae9e32180b3b9a7a68c4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the sheer volume of outbound links suggests an attempt to manipulate search engine results or distribute malicious payloads.

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://humannaturefoundation.com/uploads/1/3/0/6/130620782/130620782.html#10+ejemplos+de+vicios+de+lenguaje+cacofonia
    • http://www.upstatelivetheater-vtp.com/uploads/1/3/0/6/130604494/9445915.pdf
    • http://www.pentecostprovision.com/uploads/1/3/0/7/130739237/damizi-jilitizuxifu-bojejar-kefalete.pdf
    • http://projektrc.com/uploads/1/3/0/8/130813395/rufasutinamozaz-vonidujofuzuf.pdf
    • http://www.lespetitsgourmands.net/uploads/1/3/0/5/130588518/0c4dbfe81.pdf
    • http://learntosailswf.com/uploads/1/3/0/7/130776185/telajegeliwusexemif.pdf
    • http://dirt-bg-one.com/uploads/1/3/0/3/130323723/musolapozob.pdf
    • http://daisydecorating10.com/uploads/1/3/0/4/130436006/581d2478916.pdf
    • http://carpetcleaningservicesla.com/uploads/1/3/0/8/130873851/885057.pdf
    • http://aromascrips.com/uploads/1/3/0/6/130621457/7228391.pdf
    • http://jamiecrichton.net/uploads/1/3/0/2/130272940/6532060.pdf
    • http://sisterkeeper.org/uploads/1/3/0/5/130550940/5328676.pdf
    • http://qwodo.com/uploads/1/3/0/5/130588261/919505691c0f39.pdf
    • http://fredoalvarez.org/uploads/1/3/0/3/130312985/91daed04351be.pdf
    • http://www.lunadgames.com/uploads/1/3/0/3/130380002/redusumuzalipu_tetop_dokigimevajik_tukexufadakes.pdf
    • http://solvethru.com/uploads/1/3/0/5/130551675/lapolepololen.pdf
    • http://connecteduniversity.net/uploads/1/3/0/7/130775722/6208215.pdf
    • http://francescocamuglia.com/uploads/1/3/0/5/130546486/6e66230.pdf
    • http://horacekingston.com/uploads/1/3/0/3/130323315/karuxoxekiz_zasid_toroju_fakagogo.pdf
    • http://navigatorcart.com/uploads/1/3/0/4/130483836/2629165.pdf
    • http://iamdrwalker.com/uploads/1/3/1/0/131070302/ganatimigojesik.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_off0000720b.bin
10e9cf9cea68cca45196affca4760d1fd58331876703e30bbe86d06158e86051
pdf-font-stream PDF embedded font (sfnt) at offset 0x720B 8740 bytes