Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5db1c338a17b34…

MALICIOUS

PDF

42.3 KB Created: 2020-06-15 02:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e28ce44c2d134bc82aca1f4a39bbadd5 SHA-1: 58195652d0f15adf72a74ac274a7d287074cdcd7 SHA-256: ad5db1c338a17b348cd435fc09d176cbd26079580314e7ba8e7c3a224831e3af
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious. It contains a significant number of external links, many of which point to domains that appear to be part of a link farm or SEO spam operation. The presence of numerous external links suggests an attempt to redirect users to potentially harmful websites, likely for phishing or malware delivery. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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://host49.carmichaelnl.com/uploads/1/3/1/4/131407315/131407315.html#sigma+900+max+manual
    • http://visionministryaustralia.org/uploads/1/3/1/1/131163693/rukozogozijulimigu.pdf
    • http://carollowery.com/uploads/1/3/0/2/130272342/1753817.pdf
    • http://sisterchain.com/uploads/1/3/0/8/130813769/2915346.pdf
    • http://texanschoice.net/uploads/1/3/0/6/130621880/bobibititula_timexipu_rojerofena.pdf
    • http://wegranic.com/uploads/1/3/1/3/131381531/tumufokopebusel_peditil_jerebimagekeb.pdf
    • http://kipper.se/uploads/1/3/1/6/131606027/bodasukunamobumesik.pdf
    • https://budekukagok.files.wordpress.com/2020/06/tubijoz.pdf
    • https://fifeluvup.files.wordpress.com/2020/06/82908640297.pdf
    • https://xodugunoku.files.wordpress.com/2020/06/36484409039.pdf
    • https://gepuguxiro.files.wordpress.com/2020/06/16392826325.pdf
    • https://jarulese.files.wordpress.com/2020/06/nofujedafavividefuvixu.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_off000078be.bin
55f5095ad52da273b44e9466438cdf56037677e6c7b616ecfd070d7528f558ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BE 11052 bytes

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