Malicious PDF — malware analysis report

Static analysis result for SHA-256 7531a69e424a45bc…

MALICIOUS

PDF

49.8 KB Created: 2020-03-25 07:14:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d7e1a0d8272650b7e4e535417b564e3c SHA-1: f79c1f5ce63402f7064a38e9234c0c484b1fc0dc SHA-256: 7531a69e424a45bcc32f28c142d5c9cee2f32da3add9d6e0d0dabf3da73c53ea
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, suggesting a link farm or redirection scheme. No scripts were extracted from this sample, but the sheer volume of external links indicates a likely attempt to manipulate search engine results or redirect users to malicious content.

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://athleticadvantageplus.com/uploads/1/3/1/0/131071095/131071095.html#carl+jung+books+pdf
    • http://kaneswriting.com/uploads/1/3/0/6/130605204/piwamemawaravuxa.pdf
    • http://foundationeducation.org/uploads/1/3/0/7/130740433/duritaram.pdf
    • http://candleincome.com/uploads/1/3/0/4/130483817/3314672.pdf
    • http://metairievolvo.com/uploads/1/3/0/7/130775649/ganufexunezur_janijekakafinog_kujezofunukugid_jopexovaz.pdf
    • http://wingsofmercyart.com/uploads/1/3/0/5/130588624/nasudug.pdf
    • http://aaishbyvarsha.com/uploads/1/3/0/5/130589297/bevonuwamifaxiz_dupogujifate_polixena_sevajatebu.pdf
    • http://www.wwwblueagavestudios.com/uploads/1/3/0/2/130289239/fb6d5fa.pdf
    • http://craftitunique.com/uploads/1/3/0/8/130874544/1031951.pdf
    • http://addictedbyassociation.com/uploads/1/3/0/6/130604014/4154273.pdf
    • http://duncandavis.com/uploads/1/3/0/4/130435893/xevigofubexawilimexe.pdf
    • http://accidentreportsok.com/uploads/1/3/0/6/130620998/derobalitemajunu.pdf
    • http://uppingmygame.com/uploads/1/3/0/3/130323212/6273529.pdf
    • http://barbandcarl.com/uploads/1/3/0/9/130969311/susazujizapitar_motukugajovase_papimipod_piwodinav.pdf
    • http://www.eagleautofm.com/uploads/1/3/0/6/130620755/3914008.pdf
    • http://somosbienchula.com/uploads/1/3/0/6/130639491/f8fa9bcf9ebbac.pdf
    • http://hodline.news/uploads/1/3/0/7/130775382/9863002.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_off00009c48.bin
8a95abefa2e92e2fb037b711e6e474b38cabf8ab43282c4b4f14be5f893370dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C48 7776 bytes

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