Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fdc8aedf0c2061…

MALICIOUS

PDF

31.4 KB Created: 2020-06-15 05:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ed68abf109cbb882528f5f0ffccf34 SHA-1: b8607a4f47770a497a400f32245b4a52d97e4829 SHA-256: e0fdc8aedf0c2061a065d7fbbc5240e1ada262601c9873c02a044af3f3fccb57
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains what appears to be obfuscated text and URLs, suggesting an attempt to disguise the malicious nature of the links. The primary function appears to be directing users to a network of external PDF files, likely for malicious purposes such as SEO spam or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://designproinnovation.com/uploads/1/3/0/7/130738619/130738619.html#manual+aire+acondicionado+sanyo+split
    • http://californiacraftservices.com/uploads/1/3/1/4/131406352/mezuxetedad.pdf
    • http://lemleywarnick.com/uploads/1/3/0/5/130590482/2599834.pdf
    • http://bayviewcliffs.addorecords.com/uploads/1/3/0/3/130379447/67028.pdf
    • http://mail.anamcarafolkmusic.com/uploads/1/3/1/8/131856772/ritaviwetakixo_detukojakere.pdf
    • http://eliseimages.com/uploads/1/3/1/4/131454556/dc4ee9918cf5.pdf
    • http://hostmaster.snaggletoothbrewing.com/uploads/1/3/0/4/130489563/3645a7d1786f.pdf
    • http://mta-sts.muzsikusok.hu/uploads/1/3/0/6/130621385/16dabaf4.pdf
    • http://boothbooks.org/uploads/1/3/0/7/130776374/3347bf006a0ff7.pdf
    • https://jeronakuweni.files.wordpress.com/2020/06/dazamiv.pdf
    • https://nosuvozoj.files.wordpress.com/2020/06/89079283440.pdf
    • https://pinijerazod.files.wordpress.com/2020/06/lakefuk.pdf
    • https://movugabopiru.files.wordpress.com/2020/06/27450402543.pdf
    • https://dolajova.files.wordpress.com/2020/06/13757156491.pdf
    • https://piputefanag.files.wordpress.com/2020/06/72271600511.pdf
    • https://wuxewaxijij.files.wordpress.com/2020/06/68230662866.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_off00004adc.bin
b60d0171f6664a6a619bc08118b9d71cb11216114dcd7276aa3889890103033c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADC 11972 bytes

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