Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5ed79bff300a55…

MALICIOUS

PDF

38.0 KB Created: 2020-06-04 01:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b160442c8c96a3e9a3d976acc638cb2d SHA-1: c3b10d9dc22eda4ab86738864db1e7fcab4e292c SHA-256: 6f5ed79bff300a559bbc6a10abb26cc3282fe7725ed3bbfc27969f95c6cd8bab
96 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains a significant number of external links, characteristic of a link farm or SEO spam. The document body, though partially corrupted, contains text suggesting it is a PDF about human anatomy and physiology, likely a lure to encourage users to click on the embedded malicious links. The primary attack pattern involves tricking users into visiting a network of linked sites, potentially for further exploitation or to generate ad revenue.

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://stumblingmonkeydecals.com/uploads/1/3/1/3/131380786/131380786.html#livro+anatomia+e+fisiologia+humana+pdf
    • http://thesacreddojo.com/uploads/1/3/1/4/131453867/faponadujikuvet.pdf
    • http://sonofapitchfpv.com/uploads/1/3/1/8/131856052/d2104.pdf
    • http://mrsmorchesroom.com/uploads/1/3/0/7/130776788/pudibapap_devog_jisep.pdf
    • http://proactiveimmigration.com/uploads/1/3/1/3/131382217/sutedigukol-potikul-mokinewowol-gogevi.pdf
    • http://krisztiansandidge.com/uploads/1/3/1/3/131383314/d94a3.pdf
    • http://milyanadolashka.com/uploads/1/3/1/4/131406840/066073c9.pdf
    • http://hostmaster.womenspelvicphysiotherapy.com/uploads/1/3/1/8/131871883/visef_fenixotop_gubitovasev_rosusigu.pdf
    • http://baileyroom104.com/uploads/1/3/0/7/130738527/084ae06e9.pdf
    • http://healthoneandse2.com/uploads/1/3/0/2/130270923/863918.pdf
    • http://mx.gierkeconsultinginc.com/uploads/1/3/1/3/131379877/vilox-todibexezono-folisupamifa.pdf
    • http://fitbitenutrition.com/uploads/1/3/0/3/130313107/zotelifodipakuboj.pdf
    • http://stumblingmonkeydecals.com/uploads/1/3/1/3/131380786/terms.html
    • http://stumblingmonkeydecals.com/uploads/1/3/1/3/131380786/dmca.html
    • http://stumblingmonkeydecals.com/uploads/1/3/1/3/131380786/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://neribosu.files.wordpress.com/2020/06/11219700506.pdf
    • https://bibulegil.files.wordpress.com/2020/06/sudenavox.pdf
    • https://sekizil.files.wordpress.com/2020/06/dugazabitutajelosezadaxu.pdf
    • https://rolinozopuj.files.wordpress.com/2020/06/16621551075.pdf
    • https://livegino.files.wordpress.com/2020/06/96077529494.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006493.bin
ac63b24bcffe9a96a46f7301085cd9701d6bfee0b28857b4fef9412ab0bd03a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6493 12980 bytes