Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53b32c1801e2d05…

MALICIOUS

PDF

46.0 KB Created: 2020-03-29 08:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b71865108a62bf9adcf6e3eb9b8219e SHA-1: 930fbdab8db85146445cad39e0f4a5b95c7d0714 SHA-256: a53b32c1801e2d05efd80c9fd52c2442ab27d3009f6c4a1e8b42b2e464f17bd6
94 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. The document body, though partially corrupted, contains the text 'Cartas de control np ejercicios resueltos' and references wkhtmltopdf, suggesting it might be a lure document. The primary attack pattern involves directing users to numerous external URLs, which could host further malicious content or be part of an SEO spam campaign.

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://hall-elopement.rominastiebenphotography.com/uploads/1/3/0/8/130814078/130814078.html#cartas+de+control+np+ejercicios+resueltos
    • http://www.lettersoflight.org/uploads/1/3/0/7/130775475/8b77d83f.pdf
    • http://quakerspeak.org/uploads/1/3/0/5/130539735/zobesapepolizup-xukuwitojida-dozubu-famakapuvini.pdf
    • http://srichinmoy.us/uploads/1/3/0/5/130538996/525777.pdf
    • http://shc-ilc.hct.ac.ae/uploads/1/3/0/5/130540128/wolafozofebi.pdf
    • http://angelschic.com/uploads/1/3/0/5/130588195/xinuwinedowoz.pdf
    • http://pqsense.com/uploads/1/3/0/3/130379397/foxafuvotolaxil.pdf
    • http://ourcata.org/uploads/1/3/0/6/130605146/lafonoruf.pdf
    • http://iterodentallab.com/uploads/1/3/0/5/130588403/pakifuzegi_bemeposofemaw_lapanuvo.pdf
    • http://www.islandchiropractic.co.nz/uploads/1/3/0/6/130604858/d50e9d5cc6a65.pdf
    • http://bigpond.shop/uploads/1/3/0/6/130605302/9b062.pdf
    • http://www.anatomyandphysiologyresources.com/uploads/1/3/0/5/130590310/4c7dd83.pdf
    • http://spiritmarkpress.com/uploads/1/3/0/6/130620737/14389473.pdf
    • http://donsuponenterprise.com/uploads/1/3/0/4/130476076/towemigavu-boziparuzarur-birodenutumifud.pdf
    • http://mylocstudio.com/uploads/1/3/0/2/130271234/ee2540a.pdf
    • http://growingeducator.com/uploads/1/3/0/8/130813881/3709984.pdf
    • http://mountedcharger.com/uploads/1/3/0/3/130323212/fazewe.pdf
    • http://endoftheropeflim.com/uploads/1/3/0/2/130291785/4035959.pdf
    • http://junkpolicenj.net/uploads/1/3/0/8/130874645/nugeve.pdf
    • http://mx.talentconscious.com/uploads/1/3/0/6/130604758/8281934.pdf
    • http://www.laceycoffin.com/uploads/1/3/0/4/130488780/95723536a829.pdf
    • http://creditrestorers.org/uploads/1/3/0/4/130483244/vikudonojelaru.pdf
    • http://lenorenorrgard.net/uploads/1/3/0/6/130621695/5880823.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_off00008881.bin
00a9d875d2bd0394475aab0b447c3786f9bf56d15b6542ad797ce6fc2515fa10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8881 8784 bytes

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