Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d7aa580de058af…

MALICIOUS

PDF

45.0 KB Created: 2020-03-30 22:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 97ffe0c1c717082bc1a623f983f70698 SHA-1: 34bf488e25bca5dbf16d5adba7dabb30da4bec97 SHA-256: 64d7aa580de058afb939819be1a4cf16378881c4bda58fa609b68abfb0c8c5ff
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. The document body itself is heavily obfuscated and contains what appears to be junk data along with some URLs.

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://bwsinvestments.com/uploads/1/3/0/2/130272506/130272506.html#que+es+quimica+medioambiental
    • http://nancywhitmanjewelry.com/uploads/1/3/0/5/130588484/fff9550d57c.pdf
    • http://remedyskinandbodycare.com/uploads/1/3/0/5/130550756/jetagomerax.pdf
    • http://centerofheartistry.org/uploads/1/3/0/2/130289682/5206780.pdf
    • http://meatswithmitch.com/uploads/1/3/0/2/130287995/kibaguxo.pdf
    • http://mathlesson.com/uploads/1/3/0/8/130814562/b1dc1.pdf
    • http://probvak.com/uploads/1/3/0/4/130490687/fcc83049.pdf
    • http://trioxyclean.com/uploads/1/3/0/6/130621917/vusigitozapepuga.pdf
    • http://playsmart.co/uploads/1/3/0/3/130379412/sokopifafedu_rupoku_widijekesunire.pdf
    • http://riverratkreations.com/uploads/1/3/0/2/130289371/7847200.pdf
    • http://blog.streaac.com/uploads/1/3/0/6/130620633/bovida.pdf
    • http://metalroofingdelaware.com/uploads/1/3/0/4/130476039/6899487.pdf
    • http://diamondskinstudio.com/uploads/1/3/0/6/130605510/xidozafimav.pdf
    • http://allucaninspections.ca/uploads/1/3/0/7/130739476/vekagetowub-batebaliz-josokupilani.pdf
    • http://charterq.com/uploads/1/3/0/3/130379386/nojisi_savugalaxasatal_lezunedoved.pdf
    • http://store.rebootvb.com/uploads/1/3/0/6/130621636/3652469.pdf
    • http://honeyscrubsnstuff.net/uploads/1/3/0/6/130621002/1744738.pdf
    • http://quartersawnhomes.com/uploads/1/3/0/2/130289649/7343166.pdf
    • http://ninety-percent.com/uploads/1/3/0/5/130589140/zapuxag.pdf
    • http://thekidsmenu.net/uploads/1/3/0/8/130813420/3510802.pdf
    • http://twinriversagriculture.com/uploads/1/3/1/4/131452989/d5a1c63.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_off00008422.bin
92861a67312459f0c2003c00a6ed6cfa39d965356b23e572b304f1c4d6bb7280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8422 8960 bytes

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