Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b659ebe0e401005…

MALICIOUS

PDF

41.1 KB Created: 2020-04-11 10:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f5c4b11fc122c2d2067f70ef5177cbb3 SHA-1: 6740e245108fef95a2d1173302e04f1a9a5d27a8 SHA-256: 7b659ebe0e401005de65d263f432560aa1d3a91c052e6f708fc2449ffc6bd364
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation. One prominent link, presented in the document body as a 'Mcdonalds job application questionnaire answers', directs to 'http://delbertsonrealty.com/uploads/1/3/0/5/130589209/130589209.html#mcdonalds+job+application+questionnaire+answers'. This indicates a social engineering tactic to entice users to click on a potentially malicious URL.

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://delbertsonrealty.com/uploads/1/3/0/5/130589209/130589209.html#mcdonalds+job+application+questionnaire+answers
    • http://litchfieldsolutions.com/uploads/1/3/0/5/130547812/nesevumonalorunenu.pdf
    • http://platinumsuitestoronto.com/uploads/1/3/0/5/130540128/254056445d7f2.pdf
    • http://wisdomboiler.com/uploads/1/3/0/8/130814769/tojabeninegiretolo.pdf
    • http://tileinstallationgta.com/uploads/1/3/0/4/130483167/gomewilawumobolupub.pdf
    • http://ajoboerenhulp.eu/uploads/1/3/0/4/130436147/9364330.pdf
    • http://lealeocreative.com/uploads/1/3/0/2/130289595/9757dac05317c.pdf
    • http://rockymountainresponse.com/uploads/1/3/0/5/130588487/949947.pdf
    • http://jointdevelopment.foundation/uploads/1/3/0/5/130590663/kezekokuvapenit_vunadenopol_pafafegepewo.pdf
    • http://lemoulinetcollection.com/uploads/1/3/0/7/130775017/1121605.pdf
    • http://hdav-pro.com/uploads/1/3/1/1/131164021/toluxujijurazavolotu.pdf
    • http://terimorning.com/uploads/1/3/0/3/130313203/92fd0dcc410060b.pdf
    • http://firstclassyachtengineers.com/uploads/1/3/0/3/130323407/basujepokaj.pdf
    • http://swiftmarketingagency.com/uploads/1/3/0/3/130323705/gerurumetifigin_pifovosuwozeke_rovemekebovi_guzonetixofi.pdf
    • http://terimorning.com/uploads/1/
    • 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_off0000767c.bin
acc89a86f0060ec2d2404d925ee9fbf41de9cbfabf04bc2b9d22a5ef4a1329d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x767C 8244 bytes

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