Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c84489a8d9adcc…

MALICIOUS

PDF

34.4 KB Created: 2020-04-07 03:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da64bc7d89593fe93b6cd44537764dcd SHA-1: 2d5620782651f3bc327a0aa5563a03ec5d028dea SHA-256: 88c84489a8d9adcc50898d12dc4fa2bff5e516de0be899245e4fbada814ea51e
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized with numeric slugs, characteristic of a link farm. The ML classifier strongly indicated maliciousness. The primary intent appears to be directing users to a network of potentially malicious websites hosted on various domains.

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://theroyalchandlery.net/uploads/1/3/0/6/130621033/130621033.html#flightless+bird+american+mouth+lyrics+terjemahan
    • http://hardartclothing.com/uploads/1/3/0/3/130323542/8338293.pdf
    • http://cindyageorgetreasurer.com/uploads/1/3/0/7/130775832/bomijewi-jipozizo.pdf
    • http://woolberrystudio.com/uploads/1/3/0/2/130291030/jaxaj.pdf
    • http://twhitaker.org/uploads/1/3/0/4/130435753/6344955.pdf
    • http://malmedy-pcdr.info/uploads/1/3/1/4/131484328/nizamula.pdf
    • http://dosvatostequila.com/uploads/1/3/0/5/130539758/garubiparuse.pdf
    • http://boltphotos.com/uploads/1/3/1/3/131398233/1196b418.pdf
    • http://onpitchroofing.com/uploads/1/3/0/4/130435551/zugipupazunafo-lawupuba-kuzazawoseweb-tuguzatop.pdf
    • http://blissfultherapies.org/uploads/1/3/0/3/130323601/kisupav.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_off00005e88.bin
a8deae071fc495f5dcdbb10c1dc4015f4f3c7c3ab88aad098a66c58d12464578		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E88 7696 bytes

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