Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a992002dedcda2…

MALICIOUS

PDF

43.4 KB Created: 2020-04-05 12:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4e1106cfdb06073f1e80c0738637050 SHA-1: ba647aa9bc552d6528d4ed98215f379c4e72dbda SHA-256: 42a992002dedcda2ec444ada815cdfbde977054bd627fe42fd9309818af54767
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL, http://easyas123.xyz/uploads/1/3/0/6/130639236/130639236.html#espacio+muestral+de+lanzar+dos+dados+distintos+a+la+vez, and numerous others point to various domains, suggesting a link farm or distribution network. The ML classifier also strongly indicated maliciousness.

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://easyas123.xyz/uploads/1/3/0/6/130639236/130639236.html#espacio+muestral+de+lanzar+dos+dados+distintos+a+la+vez
    • http://trinitycastle.com/uploads/1/3/0/7/130739827/036d402eb.pdf
    • http://akeepsakewheatenterrier.com/uploads/1/3/0/5/130588256/juravoxumij.pdf
    • http://jaimoda.com/uploads/1/3/0/2/130270845/5798067.pdf
    • http://www.rockiesshrine.com/uploads/1/3/0/6/130640081/9beabb67ce2a1.pdf
    • http://arizonaretreathomes.com/uploads/1/3/0/5/130550801/a205606f13a32.pdf
    • http://lauriamusic.com/uploads/1/3/0/6/130621113/jesifupijevodapi.pdf
    • http://galhaur.com/uploads/1/3/0/7/130775921/3030658.pdf
    • http://techshouse.com/uploads/1/3/0/6/130621839/lisepapini.pdf
    • http://christinagdennehy.com/uploads/1/3/0/3/130379627/pujemugelu_fewepusig.pdf
    • http://debbireegalle.com/uploads/1/3/0/3/130313180/suxixo-mabati-kexagebidaje-foxolab.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006af2.bin
0458238a4d47a132912feccab474af76bd1cc1c9ef1e776b7079216528bc43c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF2 8804 bytes
font_01_sfnt_off00008b3e.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3E 16036 bytes

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