Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd21bc6b447fccb5…

MALICIOUS

PDF

39.6 KB Created: 2020-04-01 14:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1049414ab1474ece1f9cb75b6a67a1d5 SHA-1: 1861af11fa9afd73be50bf1b3d7f9864d6f8c3a5 SHA-256: bd21bc6b447fccb59ce5c70ea1cea07f8ea1df2e05efa01aa59807a6092f151e
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The document body contains a Spanish phrase "Porque lleva acento examen" which translates to "Why does the exam have an accent", suggesting a potential lure related to language or academic content. No scripts were extracted from this sample.

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://funtasticrental.ca/uploads/1/3/0/6/130604406/130604406.html#porque+lleva+acento+examen
    • http://studentsofsustainability.org/uploads/1/3/0/9/130969712/pimuf_ladugisukowuxo.pdf
    • http://orlandobackline.com/uploads/1/3/0/8/130874432/a2589.pdf
    • http://affordablehvacrepairs.com/uploads/1/3/0/2/130272377/tukitosomitomen-lefet.pdf
    • http://pgrm.ca/uploads/1/3/0/3/130379132/beb3fc1e121.pdf
    • http://mattjacobsphotography.net/uploads/1/3/0/6/130604201/kifibamojodu.pdf
    • http://josegrandescoffee.com/uploads/1/3/0/6/130604433/6149781.pdf
    • http://sayorale.org/uploads/1/3/0/4/130435633/merurame-bijilol-punapelifawa-vibafamonaj.pdf
    • http://juanitagrahamsmith.com/uploads/1/3/1/1/131164318/8af641c.pdf
    • http://suncountrycarpetcare.com/uploads/1/3/0/5/130545633/fodurinisixeralenev.pdf
    • http://livingpainfreepeople.com/uploads/1/3/1/4/131407818/zefekilalenab_roluwajor_xazozesubadel.pdf
    • http://solutionholdings.com/uploads/1/3/0/5/130540009/8e84af66baf2d.pdf
    • http://techfast.net/uploads/1/3/0/5/130588438/4276527.pdf
    • http://viperfishmedia.com/uploads/1/3/0/4/130475928/kobav.pdf
    • http://csiasia.org/uploads/1/3/0/2/130289467/9996195.pdf
    • http://dobbsferryafterschool.com/uploads/1/3/0/7/130776692/492888.pdf
    • http://thepearlwithinyou.com/uploads/1/3/0/6/130639126/1556219.pdf
    • http://covangroupllc.com/uploads/1/3/1/3/131384777/8118857.pdf
    • http://paxtonaviation.com/uploads/1/3/1/0/131070820/5609646.pdf
    • http://ruanntiller.com/uploads/1/3/0/4/130483507/5074724.pdf
    • http://pmsellers.net/uploads/1/3/0/6/130621342/xofuk.pdf
    • http://livefoodfestival.com/uploads/1/3/0/7/130776673/3914f861f554d5a.pdf
    • http://potusshield.org/uploads/1/3/0/4/130483457/1ccaf1a053a7ce.pdf
    • http://colin-barrett.com/uploads/1/3/0/7/130738780/499d9fe9dd5bf.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_off00007043.bin
4d35ed9414c2d7c2bec80d1505a334eccdf780ab95748533fc55558353359532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7043 8428 bytes

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