Malicious PDF — malware analysis report

Static analysis result for SHA-256 9071b9e153a19bff…

MALICIOUS

PDF

39.8 KB Created: 2020-03-20 03:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f245c5f6a7e57dd858ea47e82e7c2094 SHA-1: 2ce77d3c31a263fb6ecc715f433519a3ff61639c SHA-256: 9071b9e153a19bff4aa62f1c51090bf79b7ed5782b832f430aa92140e2273fdc
94 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier as malicious and contains a large number of external links, indicating it functions as a link farm. The primary heuristic 'PDF_SEO_LINK_FARM' confirms this, identifying 30 external PDF links. The embedded URLs are likely used to distribute further malicious content or for SEO manipulation. No scripts were extracted from this sample.

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://bhsfineartsboosters.org/uploads/1/3/0/6/130621061/130621061.html#5+mitos+de+origen+aztecas+cortos
    • http://www.cheznouslanderneau.com/uploads/1/3/0/8/130813991/684bb2e.pdf
    • http://taxpreparationcoatesville.com/uploads/1/3/0/3/130313053/jegonadunod_bimakapur.pdf
    • http://gdsmithmusic.com/uploads/1/3/0/4/130476098/91ed2.pdf
    • http://www.ecobub.com/uploads/1/3/0/4/130483132/4963415.pdf
    • http://locationawarebooks.com/uploads/1/3/0/2/130288399/8a3b60259e.pdf
    • http://happylifesupplements.com/uploads/1/3/0/5/130588529/7124969.pdf
    • http://parkselectrical.org/uploads/1/3/0/4/130483697/938075.pdf
    • http://www.jacobburt.com/uploads/1/3/0/3/130323566/rugefo.pdf
    • http://host67-131-77-202.static.ahcnm.org/uploads/1/3/0/4/130483879/guvafakixapor-posomifomoka-pojupe.pdf
    • http://hostmaster.sandalsdoggiestuff.com/uploads/1/3/0/2/130287279/9563016.pdf
    • http://www.eastoffiveboutique.com/uploads/1/3/0/9/130969431/eb0e210ac.pdf
    • http://show2web.de/uploads/1/3/0/6/130605146/7304250.pdf
    • http://t0mb0ii.com/uploads/1/3/0/2/130289256/9ffe7ebc4522b.pdf
    • http://www.helpmewithmytimeshare.com/uploads/1/3/0/6/130605048/midiboxuferobax.pdf
    • http://orduns.net/uploads/1/3/0/7/130775959/wevilutiwupo.pdf
    • http://mydigitaldiva.net/uploads/1/3/0/8/130813146/48623.pdf
    • http://ibibashotography.com/uploads/1/3/0/2/130289395/6997889.pdf
    • http://cxomentor.net/uploads/1/3/0/5/130539553/84ef1ff030cbe.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_off0000730d.bin
8b1408a94445011e62a1c1f11d56b41c60cf80541412ba117d734b54a21eae69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x730D 7940 bytes

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