Malicious PDF — malware analysis report

Static analysis result for SHA-256 252037790b9bc8c3…

MALICIOUS

PDF

52.0 KB Created: 2020-03-16 18:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 377de363e673a615aabd3f572d4076db SHA-1: 03ac1671489f1cf8a8a8df19441d29bff9ee9657 SHA-256: 252037790b9bc8c35c91624a576ad2583e49183be3a24b8a5b3f7ce229c22911
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to URLs that are part of this link farm. The primary attack pattern appears to be the creation of a link farm, likely for SEO manipulation or to distribute further malicious content via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://einelfan.com/uploads/1/3/0/7/130738614/130738614.html#a+series+of+unfortunate+events+the+reptile+room+pdf
    • http://www.springcreekfirearms.net/uploads/1/3/0/6/130604141/tomikobosuj_tavulufo_xowixejomiwo_wimijubo.pdf
    • http://exocognitive.com/uploads/1/3/0/7/130740393/sulagaburarodukuvu.pdf
    • http://rockwellhousing.com/uploads/1/3/0/8/130874170/01decf56f.pdf
    • http://www.chattanoogasoundmachine.com/uploads/1/3/0/2/130270823/rituzo.pdf
    • http://nwm5.club/uploads/1/3/0/2/130272348/1814772.pdf
    • http://www.brownkrowns.com/uploads/1/3/0/6/130639693/rimevenipej.pdf
    • http://petsgettogether.com/uploads/1/3/0/6/130621355/13fa980.pdf
    • http://www.e-classrings.com/uploads/1/3/0/6/130621093/2915460.pdf
    • http://nothernlotusayurveda.com/uploads/1/3/0/7/130739116/kafanixepusepew_wojinatagefubo_zugubap_rores.pdf
    • http://mail.colagrossifurnitureservice.com/uploads/1/3/0/6/130620601/1747766.pdf
    • http://thesteaklab.com/uploads/1/3/0/7/130776564/8967009.pdf
    • http://www.fenwickandfenwick.com/uploads/1/3/0/4/130490665/vajetemupo_jubojuvozapet_buzuxoduwoxa_visif.pdf
    • http://improveed.org/uploads/1/3/0/7/130739810/6504611.pdf
    • http://electjimsnyder.com/uploads/1/3/0/4/130435834/5323827.pdf
    • http://muffzone.com/uploads/1/3/0/5/130590661/gikizogir.pdf
    • http://amyrasplicka.com/uploads/1/3/0/5/130550931/a431803.pdf
    • http://revita-cellula.com/uploads/1/3/0/5/130540033/dowopobixi-molugosupi.pdf
    • http://8change.org/uploads/1/3/0/6/130604045/kajakinewitifo.pdf
    • http://hostmaster.sevensisterscameraclub.co.uk/uploads/1/3/0/7/130739856/wapusagon.pdf
    • http://nationwidepackinginc.com/uploads/1/3/0/5/130548192/3ab54e5.pdf
    • http://www.olypiandiner.com/uploads/1/3/0/6/130603954/2861396.pdf
    • http://edison-coffee.com/uploads/1/3/0/5/130589187/lizesubofuno-kujufuzitafon-loxijisatejat-faxiwebew.pdf
    • http://journeysofalifetime.net/uploads/1/3/0/4/130488888/4163214.pdf
    • http://micheletroy.com/uploads/1/3/0/6/130603692/c96b2.pdf
    • http://journeysofalife
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078a3.bin
dcb1141d829b7d980ebb11346a0e7a767740b0e365d2b2866587d69076c1c499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A3 9100 bytes
font_01_sfnt_off000099a5.bin
4b67bd8b0493f10ee3758b0251a31324a96f75188d2416d0fd7aecc225a32ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99A5 5520 bytes
font_02_sfnt_off0000ab19.bin
b4af6f96f752d19d2ad50de6c9253e8e258546fc13b1a7603b4e459781bc1774		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB19 6624 bytes

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