Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2060bac5c603fd5…

MALICIOUS

PDF

35.5 KB Created: 2020-06-04 03:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b0cdb491f93c3b8f76e2bda0edaf3d5 SHA-1: 206ff0a63ba5893c3ed8d45e0d14ff5a093e94e0 SHA-256: a2060bac5c603fd5ef559d681b72191cf0b0691a14de7bdb7f36d3ce26530535
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection tactic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text and embedded URLs, reinforcing the attack pattern of directing users to potentially malicious external content.

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://autodiscover.fixmyscrubber.com/uploads/1/3/0/5/130547207/130547207.html#metro+last+light+metacritic
    • http://grissumtax.com/uploads/1/3/1/1/131163890/guten_bonodazu_bogawu_dukoreliwidaze.pdf
    • http://mail.harryvoltori.com/uploads/1/3/0/7/130776239/lezevatup-ragiti-nenulubova.pdf
    • http://sportspine.net/uploads/1/3/0/6/130620716/doxinevufumoweva.pdf
    • http://southwestlifecoaching.com/uploads/1/3/1/4/131484090/bimotasekas_mevobabowuzu.pdf
    • http://issevents.com/uploads/1/3/0/5/130547728/zibesopevokakev.pdf
    • http://lemontaigne.com/uploads/1/3/1/0/131070220/4503201.pdf
    • http://autodiscover.fixmyscrubber.com/uploads/1/3/0/5/130547207/terms.html
    • http://autodiscover.fixmyscrubber.com/uploads/1/3/0/5/130547207/dmca.html
    • http://autodiscover.fixmyscrubber.com/uploads/1/3/0/5/130547207/policy.html
    • https://sirumoki.files.wordpress.com/2020/06/72419220970.pdf
    • https://gotonuxaxoxo.files.wordpress.com/2020/06/5530603455.pdf
    • https://dazemafabuse.files.wordpress.com/2020/06/97475542690.pdf
    • https://riwimatuko.files.wordpress.com/2020/06/49266046958.pdf
    • https://koxifolaligu.files.wordpress.com/2020/06/rimebuwenokab.pdf
    • https://rogosewilut.files.wordpress.com/2020/06/fosesowefinuxodepajafefub.pdf
    • https://xakisujufo.files.wordpress.com/2020/06/gaxogokapopona.pdf
    • https://moxuwovuvi.files.wordpress.com/2020/06/42904436467.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_off00006056.bin
52b8233eaa597710e765d0936d2b98303c8cb6e7872f554a87cf633ec37acc14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6056 9944 bytes

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