Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2c7a9ad11e8655…

MALICIOUS

PDF

38.7 KB Created: 2020-04-08 07:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: e1467ca809ac5f83d70eeb10cc2fe9fb SHA-1: 8eb5fd4ab5542e34399aa95cfd61836408cbd34f SHA-256: 7c2c7a9ad11e86557f860d9cc2f3ff014666032bcea8f694bb9ed9c8f60f58a1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The embedded document body text, while appearing benign, is likely a lure to disguise the malicious nature of the embedded links. The primary goal appears to be directing users to a network of potentially malicious websites.

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://reeksgolfpass.com/uploads/1/3/0/5/130550706/130550706.html#material+didactico+para+cuarto+grado+de+primaria+para+imprimir PDF link annotation
    • http://healingconnections.biz/uploads/1/3/1/4/131406785/nodamukozatare.pdfIn PDF document text
    • http://delinawells.com/uploads/1/3/1/0/131071315/2924322.pdfIn PDF document text
    • http://refacingexperts.net/uploads/1/3/0/6/130604350/4216308.pdfIn PDF document text
    • http://lamnguen.com/uploads/1/3/1/3/131379503/birinujim_madujejesowu_fevikabalo.pdfIn PDF document text
    • http://martincaicedo.com/uploads/1/3/0/5/130590545/9390629.pdfIn PDF document text
    • http://peak-trading.com/uploads/1/3/0/4/130483307/4500080.pdfIn PDF document text
    • http://baselinewellness.com/uploads/1/3/0/8/130813547/talilovobovaxi-rodabesasuj-witiloza-sozepadexakalo.pdfIn PDF document text
    • http://jaimesilversteinyoga.com/uploads/1/3/0/5/130538996/pazelusekewoxix.pdfIn PDF document text
    • http://whatsnottolovellc.org/uploads/1/3/0/3/130313553/b1120c3.pdfIn PDF document text
    • http://myfinancialarrowbusinesses.com/uploads/1/3/0/6/130604575/214242.pdfIn PDF document text
    • http://theroyalchandlery.com/uploads/1/3/0/6/130640132/dekoxonufig.pdfIn PDF document text
    • http://cristalcontabilidade.com/uploads/1/3/1/4/131406927/6559912.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000699f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x699F 9612 bytes
SHA-256: 7e58f9791c624dad9ba56251924849779075ae3fe77c2575e1d481c8dfce42d2