Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bd99864da3f74d…

MALICIOUS

PDF

44.8 KB Created: 2020-03-09 09:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4ef04e3f71c0ce276b45d3f77d4c54c SHA-1: a05924b73d42ac80f837c76ffb8ae06c4d918097 SHA-256: b6bd99864da3f74d4ec9e89690233fcf78fe5f5840b3d153a64f5ea73456cfc9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links to other PDF files hosted across numerous domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body text is heavily corrupted, making it difficult to ascertain a specific lure beyond the presence of numerous external links.

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://bocaijiqiaoleiwenzhang.br3h.com/uploads/1/3/0/7/130775465/130775465.html#ancient+indian+history+quiz+questions+and+answers+in+hindi
    • http://bestofthemenu.com/uploads/1/3/0/2/130289549/e6ae10c0f95b.pdf
    • http://jayworks.org/uploads/1/3/0/6/130620490/5622167.pdf
    • http://www.bosfairskies.com/uploads/1/3/0/2/130289380/rinipikidos_gavusisogeworez.pdf
    • http://www.lavecchiafattoriadamarica.com/uploads/1/3/0/6/130639344/b8629.pdf
    • http://yournextstepec.com/uploads/1/3/0/2/130289415/9644489.pdf
    • http://santeeautobody.com/uploads/1/3/0/5/130588999/ab45fbe641f02e.pdf
    • http://ellasarmyinc.com/uploads/1/3/0/6/130639770/3f8df.pdf
    • http://wickedfreshsalad.com/uploads/1/3/0/7/130775331/9557715.pdf
    • http://astrologyandcrystallighttherapy.com/uploads/1/3/0/2/130272406/4fc7d778cdd0.pdf
    • http://caratcoffee.com/uploads/1/3/0/7/130776070/9272326.pdf
    • http://www.utahleadmagnet.com/uploads/1/3/0/7/130740117/ronalurepi.pdf
    • http://kathleenokeefegaligher.com/uploads/1/3/0/4/130483045/vanodakerexonuxotoba.pdf
    • http://worldfurs.org/uploads/1/3/0/5/130539517/1fb87feb.pdf
    • http://northernyoga.ca/uploads/1/3/0/3/130379135/wisawerabubazum.pdf
    • http://leadershipandstrength.com/uploads/1/3/0/6/130603715/xanunopogo-winisijoj-zudegej.pdf
    • http://tllafleur.com/uploads/1/3/0/4/130476091/doxotovow-vuriberebem.pdf
    • http://www.meclothing-shop.co.uk/uploads/1/3/0/4/130488098/wewus_zovezab_losiworugidiv.pdf
    • http://a-custom-esl-tutoring.com/uploads/1/3/0/6/130640069/0c83c182d12c.pdf
    • http://imaginaryrats.com/uploads/1/3/0/5/130543568/vuwalewururi_guviwutiketom_bejexin.pdf
    • http://clarknewton.com/uploads/1/3/0/5/130539612/zudasida.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_off000085df.bin
b9c4e81b2a02a5581d159c168ff20f11f7cf235dc1ab010a296d4cea13310942
pdf-font-stream PDF embedded font (sfnt) at offset 0x85DF 8168 bytes