Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab3ee2d50102251…

MALICIOUS

PDF

43.6 KB Created: 2020-03-14 21:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: be61410cf646cc6eb5665d073a1901dc SHA-1: 68b178bf57aa65612813317d82f0ae1fbac5b6f7 SHA-256: 6ab3ee2d5010225177e3beeb0d3f6edac6c00fc6df8d13984d112cf431be46b7
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs, suggesting a link farm or SEO spam campaign. The embedded document body, though partially corrupted, contains text that appears to be a lure. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for containing numerous external links.

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://bianxingjingangzhenren.br3h.com/uploads/1/3/0/4/130436172/130436172.html#american+heartworm+society+guidelines+feline
    • http://solutionsforenergy.co.uk/uploads/1/3/0/2/130271232/biluj_puroziwaropuza_kojuxesuzi.pdf
    • http://narcsandco.com/uploads/1/3/0/5/130588222/raxadut.pdf
    • http://plainenglishfordoctors.com/uploads/1/3/0/5/130543976/nonadotebanatesozug.pdf
    • http://amor-mundi.org/uploads/1/3/0/7/130775245/9563211.pdf
    • http://www.prescottdanceclub.com/uploads/1/3/0/4/130483303/ddf4d.pdf
    • http://www.adaptandexcelchiro.com/uploads/1/3/0/4/130488590/bd536e86a.pdf
    • http://www.harrisonyearbook.com/uploads/1/3/0/2/130289213/6731010.pdf
    • http://andrewconstantineart.com/uploads/1/3/0/5/130547340/rejatij.pdf
    • http://stevencanyon.com/uploads/1/3/0/7/130740440/1177817.pdf
    • http://beautifulneuralnetworks.com/uploads/1/3/0/6/130639227/527676.pdf
    • http://aliferediscovered.com/uploads/1/3/0/6/130622073/1e351ef.pdf
    • http://europlast-okna.pl/uploads/1/3/1/1/131163836/3132049.pdf
    • http://www.johnsaundersartcom.com/uploads/1/3/0/4/130475928/dinapagogukorog.pdf
    • http://jazatyorbadrive.com/uploads/1/3/0/4/130490774/1735cc3a14afd.pdf
    • http://blogtogether.com/uploads/1/3/0/6/130605435/b3553dd0efa9472.pdf
    • http://runamaid.com/uploads/1/3/0/6/130639445/gobamokot.pdf
    • http://www.gustavoramosart.com/uploads/1/3/0/8/130873994/reredejuf.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_off00008325.bin
28fe513967826b50cce0f49c63c389692f7c8a35d41863eb2bab0b467dc77be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8325 7600 bytes

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