Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b12021e9b662e39…

MALICIOUS

PDF

34.8 KB Created: 2020-04-02 08:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d4d0d920467073d3489f5cac76812ec2 SHA-1: 07872dffede6b205fac03ba409408afd8591597c SHA-256: 3b12021e9b662e39d3ba28f1e3dd40eda42cd4be5755c2eb474cfe1663906700
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be generated for SEO purposes, indicating a link farm strategy. The primary lure text 'juvenile detention center chicago careers' is present in the document body and also in one of the external URLs. The ML classifier strongly flagged this PDF as malicious. The presence of numerous PDF links and the ML score suggest this is a malicious SEO-driven content distribution scheme.

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://ginawarrior.com/uploads/1/3/0/7/130776298/130776298.html#juvenile+detention+center+chicago+careers
    • http://afrometrics.com/uploads/1/3/0/5/130542728/lodazazavexanuj.pdf
    • http://fullpotentiallifestyle.com/uploads/1/3/0/9/130969130/rizogogat.pdf
    • http://satterwhitelegal.com/uploads/1/3/0/8/130874317/2235b642.pdf
    • http://dannydorito.com/uploads/1/3/0/2/130289629/zukivodudapu-forevazogog-dajutudetufik-mezeluworanaxe.pdf
    • http://philippinechiropracticcollege.com/uploads/1/3/0/2/130288006/d39cecf.pdf
    • http://kurtwahrmund.com/uploads/1/3/0/3/130324386/7294fedc.pdf
    • http://zakerytunes.com/uploads/1/3/0/4/130436354/3914803.pdf
    • http://kyriakosllc.org/uploads/1/3/0/9/130969212/tonebafikekabob_vizaxutagalizuv.pdf
    • http://islandwideassist.com/uploads/1/3/0/7/130776367/3823471.pdf
    • http://informstamu.com/uploads/1/3/0/5/130588786/vabezi_jomujukorum_xexogekapefabi_gekojufumesos.pdf
    • http://starlite.tech/uploads/1/3/0/2/130272898/tideruriseberusaju.pdf
    • http://jwsfittinginstallationltd.com/uploads/1/3/0/8/130814863/kapet-gudera-julazemoxe.pdf
    • http://nswellness.org/uploads/1/3/0/8/130814310/6390698.pdf
    • http://brooklyn-grace.com/uploads/1/3/0/5/130539758/00c8a19acb.pdf
    • http://atxtitleman.net/uploads/1/3/0/8/130874050/zituveki.pdf
    • http://prosperitypanties.com/uploads/1/3/0/3/130323249/detitezogidu_zezijizumuvul.pdf
    • http://dalgill.com/uploads/1/3/0/6/130640053/2973396.pdf
    • http://brickyarddentalclinic.ca/uploads/1/3/0/2/130291036/kujejexuka_xiguwixutudunez.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_off00005ff2.bin
12b3dd5f1428b6d3bc8314a2da504a3edb66b19815694c15b56915f94d37e629
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF2 7588 bytes