Malicious PDF — malware analysis report

Static analysis result for SHA-256 636051136e8ead96…

MALICIOUS

PDF

55.2 KB Created: 2020-03-24 23:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5919c54f7834c685e7898a268c1f1864 SHA-1: 5277bb368f50dbcfa58562cfaec62f40bbbc98e8 SHA-256: 636051136e8ead9600aabbc0d0d18097608f8280dd3158d600a8746ada2cb6d6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains a title related to 'origami 3d' and references the wkhtmltopdf tool, suggesting a potential lure or content disguise. The primary attack pattern appears to be the distribution of a large number of external links, likely for SEO manipulation or to serve as a gateway to further 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://mysaphi.com/uploads/1/3/0/7/130739105/130739105.html#historia+del+origami+3d
    • http://judebaderle.com/uploads/1/3/0/7/130740551/9903593.pdf
    • http://sherbetstreet.com/uploads/1/3/0/8/130814909/2346000.pdf
    • http://caffelina.com/uploads/1/3/0/2/130287221/tugigawoxexew.pdf
    • http://mta188.qualitynow.net/uploads/1/3/0/4/130494172/gudoberojusu.pdf
    • http://original.vaughan.co.nz/uploads/1/3/0/6/130639343/pekizakijotupobam.pdf
    • http://germanbedbugs.com/uploads/1/3/0/4/130435596/dogusalazawiso-vumevu-weseviwutaj.pdf
    • http://rocksolidskilltraining.com/uploads/1/3/0/6/130604547/1aae613f7916.pdf
    • http://brianherrick.net/uploads/1/3/0/7/130775205/sevapavomujet.pdf
    • http://www.holytabernacleofjesuschrist.org/uploads/1/3/0/6/130621353/pozok-bujepipa-fibune-zadanida.pdf
    • http://goldennectarfoods.com/uploads/1/3/0/4/130483830/mabopumajuzup.pdf
    • http://sleepvillecanada.com/uploads/1/3/0/7/130775968/9627987.pdf
    • http://mx.incrementall.com/uploads/1/3/0/7/130775826/248290.pdf
    • http://missfass.com/uploads/1/3/0/8/130814718/ed8cb2.pdf
    • http://quaizer.net/uploads/1/3/0/5/130542875/a695c29d50d.pdf
    • http://monicadigiovanni.com/uploads/1/3/0/4/130488493/6675915.pdf
    • http://maneater.online/uploads/1/3/0/6/130620473/81c43d6db39.pdf
    • http://mta-sts.mx.animalhospitalofpitt.com/uploads/1/3/0/7/130776741/gasox.pdf
    • http://becomeless.com/uploads/1/3/0/3/130379143/vesugexaluwaxosogoko.pdf
    • http://taigachristie.net/uploads/1/3/0/2/130270768/pukugifalike.pdf
    • http://my-living-benefits.com/uploads/1/3/0/5/130546243/pibapib.pdf
    • http://newyearswim.co.uk/uploads/1/3/0/7/130739833/3158801.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a90.bin
2b0b595fcb45ed3376b8aeff1ffb8cc4914b8f74f218dbacf41aea2bbf8d32f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A90 9956 bytes
font_01_sfnt_off0000bd3f.bin
7e8101cb5acc5cd0af1adf60170572a50164d3e0c042e176ad03bebbf2353cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3F 4972 bytes

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