Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d993f73698767cd…

MALICIOUS

PDF

42.1 KB Created: 2020-03-25 09:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb463a318ef91f6327f9bff9f56ed652 SHA-1: 05cd8ebc365b71e41da797fee9bdee387b6f94f2 SHA-256: 7d993f73698767cdac69349937a3444e554260a9ff82170eca2e6e3624dcde47
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 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 PDF files hosted on different domains. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the structure suggest a link farm or a distribution mechanism for further malicious content, rather than a legitimate document.

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://kindspa.com/uploads/1/3/0/5/130590029/130590029.html#top+high+school+choir+songs
    • http://juliablack.net/uploads/1/3/0/6/130639661/6107402c63.pdf
    • http://integratedvalue.org/uploads/1/3/0/4/130494289/rojukozukuravok.pdf
    • http://babypassiondoula.com/uploads/1/3/0/6/130639548/2016879482a95.pdf
    • http://psorted.com/uploads/1/3/0/5/130551727/27a070762.pdf
    • http://plaidacres.com/uploads/1/3/0/3/130379465/8514970.pdf
    • http://visithalfmoonbay.com/uploads/1/3/0/6/130603971/gozuguxevetojig_rofis_fotafub_butesotopinuxa.pdf
    • http://mail.rachaelfrankford.com/uploads/1/3/0/9/130969469/wobiv_lawazixogas_dekemotap.pdf
    • http://montessoriforpeace.net/uploads/1/3/0/6/130605263/ropabemonurakeju.pdf
    • http://investorsmarketresearch.com/uploads/1/3/0/4/130488741/6504240.pdf
    • http://clinipal.net/uploads/1/3/0/7/130775363/sepefeta.pdf
    • http://economicdevelopment.info/uploads/1/3/0/6/130603873/6835738.pdf
    • http://themichigantutor.com/uploads/1/3/0/8/130874318/pominum_gajus.pdf
    • http://digitalmei.com/uploads/1/3/0/4/130476429/neforegari.pdf
    • http://whitehoneydew.com/uploads/1/3/0/5/130589312/nupudagiroxakewokoju.pdf
    • http://nlpcoursesmelbourne.com/uploads/1/3/0/2/130272406/nibopefevamowe_pazenej.pdf
    • http://bresumbrella.org/uploads/1/3/0/6/130621361/8646350.pdf
    • http://theelectronicsdepotinc.com/uploads/1/3/0/5/130539267/kabulofibonubo.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_off00007956.bin
6e760536c759aa1bc5b2acf1144e15d48194a1e1c9a1ecff95d1fadef72793d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7956 8480 bytes

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