Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3ade00149c1eac…

MALICIOUS

PDF

83.5 KB Created: 2020-06-15 00:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 4e7fee46ed45e6c2d50827de098ab845 SHA-1: f64ae8e3440a1ded6dfd8418ad991e88e05a4949 SHA-256: be3ade00149c1eac9b826b68481ace41e52c1c24b8cc7500d3c63a11cf420fd3
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. The document body suggests it is a worksheet answer key, a common lure for phishing or malware delivery. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, likely to improve search engine ranking for malicious content or to distribute malware through a large number of seemingly innocuous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://agtco.net/uploads/1/3/0/8/130814535/130814535.html#what+happens+when+two+fruit+companies+merged+worksheet+answers PDF link annotation
    • http://coldhaushistory.com/uploads/1/3/0/9/130969750/radepuk.pdfIn PDF document text
    • http://chaincrossing.com/uploads/1/3/1/3/131381231/kadagobujafi.pdfIn PDF document text
    • http://arizonaluxuryrealty.org/uploads/1/3/0/2/130289509/ropuwama.pdfIn PDF document text
    • http://creditrise.us/uploads/1/3/0/6/130620345/nekaxij.pdfIn PDF document text
    • http://storkconsultancy.com/uploads/1/3/0/8/130873945/8773157.pdfIn PDF document text
    • http://addicted-2-gaming.com/uploads/1/3/1/4/131483138/52f83b8.pdfIn PDF document text
    • http://mta-sts.wakeforestmarket.com/uploads/1/3/0/2/130291712/f4428d923e1df.pdfIn PDF document text
    • http://florsnmore.com/uploads/1/3/0/7/130740000/bdeec6ad869470.pdfIn PDF document text
    • http://ericaschoice.net/uploads/1/3/1/6/131606431/delexakuwibepe-kelibesit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bawegepagema.files.wordpress.com/2020/06/nubivimobumijigabom.pdfIn PDF document text
    • https://lewupopeg.files.wordpress.com/2020/06/fimofatapabaxip.pdfIn PDF document text
    • https://nemununuban.files.wordpress.com/2020/06/jipaxefavu.pdfIn PDF document text
    • https://zigovej.files.wordpress.com/2020/06/6580452752.pdfIn PDF document text
    • https://vudilofifo.files.wordpress.com/2020/06/puduwijexewajejir.pdfIn PDF document text
    • https://lotopakaxil.files.wordpress.com/2020/06/fasesukataruxaliwekiza.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 11900 bytes
SHA-256: 662bc39194f67d3a5d1493a9b3f472a5e7abc192e0d3cde1c4d88cbfc482f907

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