Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b3965e8e3ddef6…

MALICIOUS

PDF

41.0 KB Created: 2020-04-09 11:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ccb6e93337dab2ef0922c3d1dd2f6247 SHA-1: 7cc101597463e55dae2c135cb10ecf3bc1fa02dd SHA-256: b1b3965e8e3ddef6c438ea7fcfabd09681745a11abbb284c63926aff69de1570
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The document body, though partially obfuscated, contains text that suggests a 'discussion panel' lure, and the embedded URLs point to various domains, many of which appear to be part of a link farm. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://bodyworkbybarb.com/uploads/1/3/1/4/131438228/131438228.html#ejemplo+un+panel+de+discusi%C3%B3n
    • http://eloriginalnightclub.com/uploads/1/3/1/4/131409167/55b18e03e1.pdf
    • http://rbarlawrence.com/uploads/1/3/1/3/131379340/b69462986cea86.pdf
    • http://finanz-reparaturservice.com/uploads/1/3/0/2/130289019/9599628.pdf
    • http://tausepalumni.com/uploads/1/3/0/6/130639779/masubelovajoxu.pdf
    • http://kingcashchasencorp.net/uploads/1/3/0/7/130775361/gadatuza.pdf
    • http://getffreejava.com/uploads/1/3/1/0/131070490/e84b4ffaa.pdf
    • http://longsolutionsgroup.com/uploads/1/3/0/6/130621874/toketowoxuzulijiled.pdf
    • http://tidybytori.com/uploads/1/3/0/6/130639840/79a7f022e.pdf
    • http://brodeurhort.com/uploads/1/3/1/4/131408664/e6641.pdf
    • http://newhopephotographylakeland.com/uploads/1/3/0/6/130604885/zeburefuj-nerurid.pdf
    • http://apkzebra.com/uploads/1/3/0/7/130775685/tanijotap_javagav.pdf
    • http://shedrums.net/uploads/1/3/0/4/130490786/9418277.pdf
    • http://theagentp.com/uploads/1/3/0/4/130476978/malamelikedoja.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_off0000758b.bin
5cd1ced97e5956dd851cec9c1f8395e87b624b2cc0d5368a9dd7ccacf02093c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758B 8704 bytes

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