Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f82ce575210ce4a…

MALICIOUS

PDF

39.1 KB Created: 2020-03-09 08:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 209480522c35dcae833026e696e9d482 SHA-1: 6465e19062110cad0649355539cfd16f4c2bf955 SHA-256: 5f82ce575210ce4ae9884068cf945533b2b4880cc83977bc582b41da865b867a
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm or SEO spam. The embedded URLs, such as http://tcsonline.net/uploads/1/3/0/8/130873784/130873784.html#adjetivos+en+ingles+positivos+comparativos+y+superlativos, point to various domains, suggesting an attempt to distribute traffic or host potentially harmful content. No scripts were extracted, but the sheer volume of outbound links indicates a malicious intent to redirect 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://tcsonline.net/uploads/1/3/0/8/130873784/130873784.html#adjetivos+en+ingles+positivos+comparativos+y+superlativos
    • http://murphyslawfitness.com/uploads/1/3/0/5/130539319/pidajojifabidaf.pdf
    • http://kunznator.com/uploads/1/3/0/6/130621757/1f3e790ca.pdf
    • http://chrisjaye.com/uploads/1/3/0/4/130483320/rarilav.pdf
    • http://meatcraftnj.com/uploads/1/3/0/7/130739116/ninom-razudadu-vifuliruderaw.pdf
    • http://www.energystoneproducts.com/uploads/1/3/0/6/130605283/rubatalemejivu-tunepenerifotet-dekawusakiju.pdf
    • http://thescotchapp.com/uploads/1/3/0/2/130289695/7332230.pdf
    • http://rechtsanwaltskanzlei-marion-c-spanier.de/uploads/1/3/0/6/130639553/vuvidim.pdf
    • http://foreverboutique.net/uploads/1/3/0/3/130313729/watetu_tunusu_fezig.pdf
    • http://jonahwolfraim.com/uploads/1/3/0/2/130289632/172483ea52f4.pdf
    • http://thebodyshapers.eu/uploads/1/3/0/8/130813992/zoloreri.pdf
    • http://villagebaptistchurch.info/uploads/1/3/0/6/130604903/7589564.pdf
    • http://mhwilleke.net/uploads/1/3/0/6/130620619/4f5c3b97ca1d6a.pdf
    • http://fknhigh.com/uploads/1/3/0/7/130739952/43aa4ad.pdf
    • http://hostmaster.theartistonthebeach.com/uploads/1/3/0/7/130740178/bfa5256.pdf
    • http://www.escwire.com/uploads/1/3/0/5/130588865/gutonup.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_off00006f67.bin
6f7482abe9c1e67002b678fbbafdfa1aa979997d1d0e8c299910c3496705de86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F67 7968 bytes

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