Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c7499b211fff87…

MALICIOUS

PDF

40.3 KB Created: 2020-03-09 05:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 992b208a9117d5503142a207b484e568 SHA-1: a9e8d21b57fce7743e7be5b4355d6294cb12a110 SHA-256: 67c7499b211fff875accd1fa0706420a11cab528a84238d0a2e7db02fb989664
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The embedded content, while appearing to be about statistics, is heavily obfuscated and contains URLs that are likely used to download further malicious content or redirect to phishing sites. The ML classifier strongly indicated maliciousness.

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://quanxunwangbeiyongwangzhi.br3h.com/uploads/1/3/0/6/130604416/130604416.html#how+to+work+out+interquartile+range+on+a+cumulative+frequency+graph
    • http://www.maxgirouxpro.org/uploads/1/3/0/8/130873868/jepab.pdf
    • http://ns1.2sisterskarma.com/uploads/1/3/0/6/130620282/fd6c558cfa7.pdf
    • http://viplimoerie.com/uploads/1/3/0/8/130874252/5be3b076a1.pdf
    • http://www.trulyoffensive.com/uploads/1/3/0/2/130272372/vipeleviwoxemez_dusep_jijavap.pdf
    • http://dianehunterart.com/uploads/1/3/0/4/130488946/rejokokozofazanuv.pdf
    • http://themileycollectiononline.com/uploads/1/3/0/7/130739105/1124027.pdf
    • http://www.treatui.com/uploads/1/3/0/6/130620808/8091aa.pdf
    • http://mercy-reigns.com/uploads/1/3/0/7/130775583/8816865.pdf
    • http://thearieldiamonds.com/uploads/1/3/0/8/130873975/pageweralebuxi.pdf
    • http://www.paintyourfeeling.com/uploads/1/3/0/5/130589124/wometot.pdf
    • http://www.blessedmoondoula.com/uploads/1/3/0/4/130483886/7874205.pdf
    • http://heauxbeaux.com/uploads/1/3/0/5/130551050/wafubabig.pdf
    • http://webmail.muttairbrushandartsupply.com/uploads/1/3/0/5/130546971/215a30ab40ac1.pdf
    • http://mta-sts.mail.sisslemisdorf.ch/uploads/1/3/0/8/130813398/6625206.pdf
    • http://lorahakanson.com/uploads/1/3/0/2/130289354/fixamovik-fikowut-zajodemi-xegukuvasonal.pdf
    • http://mail-manzzani.com/uploads/1/3/0/2/130288549/833e0c83dda3.pdf
    • http://shannonposey.com/uploads/1/3/0/8/130813533/2636068.pdf
    • http://mileoneinc.com/uploads/1/3/0/7/130775198/e4978f3ea1.pdf
    • http://seanseitzrealtor.com/uploads/1/3/0/8/130813987/905345.pdf
    • http://find-keep.com/uploads/1/3/0/5/130589433/3303071.pdf
    • http://barandcloset.com/uploads/1/3/0/3/130323298/kevaxaxokexupugutuzo.pdf
    • http://lucky13lawncare.com/uploads/1/3/0/5/130550903/478255.pdf
    • http://marketingkismet.com/uploads/1/3/0/4/130436122/e14ec0b.pdf
    • http://elitesip.com/uploads/1/3/0/6/130640015/5718445.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_off0000740a.bin
1f01b2b4fac165e15a76f8eadcd04695a6e355d6199fc6758f58a128cd4b1312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740A 7944 bytes

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