Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a1ec8a06dafe8f…

MALICIOUS

PDF

56.2 KB Created: 2020-06-05 18:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff9af190eac2759cbd5824965a81e71c SHA-1: 42124273a00767d510156cac1e261fe4af059adb SHA-256: 18a1ec8a06dafe8ff6d00c419b1ba948ccea266067345b57358bc7a63f03fe8f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links to external websites, many of which are structured as SEO-optimized PDF documents. The primary lure appears to be a link to a page claiming to be an 'Oscar Schmidt autoharp serial number database', which redirects to a malicious URL. The ML classifier strongly indicated maliciousness, and the overall structure suggests a link farm used for malware distribution.

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://74-123-72-180.mgwnet.com/uploads/1/3/0/4/130478106/130478106.html#oscar+schmidt+autoharp+serial+number+database
    • http://usaservices.solutions/uploads/1/3/0/5/130589322/4788359.pdf
    • http://cumberlandelectricllc.com/uploads/1/3/0/7/130776425/1941910.pdf
    • http://columbiariverguestranch.com/uploads/1/3/1/3/131379700/xujezi.pdf
    • http://startatruestory.com/uploads/1/3/1/8/131871622/biriwukikak-fiwanulaberajap-kuxireke.pdf
    • http://blog.kortomomolu.com/uploads/1/3/0/9/130969907/2727026.pdf
    • http://74-123-72-180.mgwnet.com/uploads/1/3/0/4/130478106/terms.html
    • http://74-123-72-180.mgwnet.com/uploads/1/3/0/4/130478106/dmca.html
    • http://74-123-72-180.mgwnet.com/uploads/1/3/0/4/130478106/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dogefiduz.files.wordpress.com/2020/06/lesebebojizanudud.pdf
    • https://xedebixudo.files.wordpress.com/2020/06/zowafulimobemedosoza.pdf
    • https://viratuzuk.files.wordpress.com/2020/06/53836672986.pdf
    • https://lewoxosi.files.wordpress.com/2020/06/7335408023.pdf
    • https://tojumil.files.wordpress.com/2020/06/xomup.pdf
    • https://womemeb.files.wordpress.com/2020/06/79826740596.pdf
    • https://nudokux.files.wordpress.com/2020/06/fapatudu.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_off0000b139.bin
ed21322f6503c41efaa7cdede9c77095bd4d2996c8ec67571f449a040d1f8c3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 10400 bytes

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