Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d355d70fd032bc…

MALICIOUS

PDF

49.3 KB Created: 2020-04-08 01:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 1cd9b0a10ad181bdceff415907ba44c6 SHA-1: cbc7a66690b98b8c1caf9ed2ca65d7b9cf6498cb SHA-256: 58d355d70fd032bc90651e1bfbeb11b6dc6e6e013407b21ec38add523265381d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by a machine learning classifier as malicious. It contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, which are likely part of a link farm designed to distribute malware or conduct phishing attacks. The document body contains obfuscated text and references to wkhtmltopdf, suggesting it was programmatically generated to host these 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://mgtavconference.com/uploads/1/3/0/6/130639178/130639178.html#avatar+the+last+airbender+font PDF link annotation
    • http://fatnail.com/uploads/1/3/0/7/130775328/pofikoxarafewejewe.pdfIn PDF document text
    • http://maestroadvisor.com/uploads/1/3/0/7/130775727/jixox.pdfIn PDF document text
    • http://qstc.org/uploads/1/3/0/5/130588426/kawokerabug_zuverodiditiguz_zolugu.pdfIn PDF document text
    • http://embassyevents704.com/uploads/1/3/0/5/130539658/7859344.pdfIn PDF document text
    • http://stichtingjubilee.nl/uploads/1/3/0/7/130739876/favuvutimixigam-susopibapevuno-mokol.pdfIn PDF document text
    • http://clickfourhelp.com/uploads/1/3/0/2/130288532/kakoram-rapusafuki-nizirirar.pdfIn PDF document text
    • http://laurarobinson.com/uploads/1/3/0/8/130813821/mizolod-fepezabuvex-vufutugisuna-juxebetezojuzo.pdfIn PDF document text
    • http://peacefulbeginningsds.com/uploads/1/3/0/6/130622013/tugij_rinode_silanozid.pdfIn PDF document text
    • http://jennyandbryanalcazar.com/uploads/1/3/0/5/130589244/mugezopuv_paxefemotidu_nokotoporame.pdfIn PDF document text
    • http://mannonfamily.com/uploads/1/3/0/6/130620512/9446868.pdfIn PDF document text
    • http://myecobeauty.com/uploads/1/3/0/6/130639571/2519777.pdfIn PDF document text
    • http://ulteriormotion.com/uploads/1/3/0/7/130776490/bizinavikuze_feraxitidizos_sisigexanoru.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.adobe.com/).NotoIn PDF document text
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn PDF document text
    • http://scripts.sil.org/OFLNotoIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000767e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x767E 7856 bytes
SHA-256: a69a7c1eb8292c1b7126255c4c52ee1fb5d1948b2f82150fcd0dd7eef2a342c5
font_01_sfnt_off000094ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94EA 4396 bytes
SHA-256: 27267955947fcba7e64e5dc3845fc92709dad099e4dd021c70dcb177dbfe9445
font_02_sfnt_off0000a2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2FC 16084 bytes
SHA-256: d65752e558a9090157c9a1b02647c04d2680198cf9d52ff42939ef8ccbf7fabd

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