Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef4deb46b7556b0…

MALICIOUS

PDF

40.5 KB Created: 2020-04-06 12:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dbf376224bc8010a98bfd2fb30d10429 SHA-1: 7b25736493e8d29256c73d46921465686f9a7f61 SHA-256: 6ef4deb46b7556b0410bf1547eda93269083ca11e6fd32274807dc37ed760f4c
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though partially corrupted, contains a URL that is also present in the list of extracted URLs. This suggests the document's primary purpose is to redirect users to a network of potentially malicious or SEO-manipulated websites.

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://wehappyhair.com/uploads/1/3/0/5/130589239/130589239.html#ion+color+brilliance+bright+white+creme+lightener
    • http://seattleluxurylimos.com/uploads/1/3/1/4/131407635/3709775.pdf
    • http://empresadeenergiadebogotasaesp.com/uploads/1/3/0/7/130738972/leraxut-tirokeribojo-sefelifani.pdf
    • http://mysolovacations.com/uploads/1/3/0/7/130775997/6a794d2.pdf
    • http://clutchstuff.net/uploads/1/3/0/2/130291766/6ed9b.pdf
    • http://floodteamapparel.com/uploads/1/3/0/7/130738836/jumakuwog_gisonijataz_lowim_xajowexe.pdf
    • http://instituteofbuddha.org/uploads/1/3/0/4/130490117/028f75f87.pdf
    • http://cumcloset.com/uploads/1/3/1/4/131407892/66557d248c862.pdf
    • http://kathleenstanko.com/uploads/1/3/1/0/131070171/8579699.pdf
    • http://primingcapital.net/uploads/1/3/0/6/130603838/pajuv.pdf
    • http://webbscleaningservices.net/uploads/1/3/0/3/130323581/wapubagijijefamis.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_off00007740.bin
0de0bf1c5e62672dad57117bfc3255bff30f1cf4ca1e0a118ba31ea5c2d738f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7740 7580 bytes

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