Malicious PDF — malware analysis report

Static analysis result for SHA-256 70607ab89ad39f0f…

MALICIOUS

PDF

56.0 KB Created: 2020-03-29 11:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9e65ce7d138ef2e78ed8a07d350b52d3 SHA-1: 51b0497a29f4a1dc189d695eeeae28a2d8c0767b SHA-256: 70607ab89ad39f0fbc51da9949ecd1ae59e8e7892a009ac5f3f922ec23cc9906
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious content. The document body, though partially corrupted, suggests a lure related to educational material. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm or content distribution attack.

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://mta-sts.mx.transitionplan.org/uploads/1/3/0/4/130491932/130491932.html#circuitos+rlc+paralelo+ejercicios+resueltos
    • http://ipsum-gaming.com/uploads/1/3/0/8/130873902/gidus-tobafonulezim.pdf
    • http://serenityinstone.com/uploads/1/3/0/3/130323703/memitawumotapinam.pdf
    • http://maebee.net/uploads/1/3/0/6/130640032/buwikejefep.pdf
    • http://huntleyirrigation.com/uploads/1/3/1/3/131378814/5008532.pdf
    • http://iguanasurfschool.com/uploads/1/3/0/5/130588700/xerajir.pdf
    • http://jenniesutton.net/uploads/1/3/1/3/131379012/2d02de.pdf
    • http://boomersblessings.com/uploads/1/3/0/7/130775635/8b90ab5eaa4878.pdf
    • http://msgllc.co/uploads/1/3/1/0/131070498/c49b0da6f.pdf
    • http://theodorwollmanmeyer.com/uploads/1/3/0/5/130589195/96980e22371d51.pdf
    • http://secureretirementinc.com/uploads/1/3/0/7/130739540/mabib.pdf
    • http://bellydancebelles.com/uploads/1/3/0/8/130873796/557b483.pdf
    • http://takusicompanylimited.net/uploads/1/3/0/8/130873712/segugofoxatebu_nolulesemezana.pdf
    • http://smalltownweather.com/uploads/1/3/1/1/131164243/tinubu.pdf
    • http://theapplemechanic.com/uploads/1/3/0/5/130588501/6418201.pdf
    • http://timelessalpha.shop/uploads/1/3/0/5/130539446/6553d307f69c23.pdf
    • http://5thwoman.com/uploads/1/3/0/8/130813972/wakapud.pdf
    • http://10122006.com/uploads/1/3/0/7/130739196/d4b5719a.pdf
    • http://freda.xyz/uploads/1/3/0/6/130621141/70ec70d851.pdf
    • http://julia-phillips.com/uploads/1/3/0/3/130323547/waxekazumumij.pdf
    • http://andysframe.com/uploads/1/3/0/8/130814960/zufizemaseda.pdf
    • http://nautanotherbakingblog.com/uploads/1/3/0/7/130739032/5705810.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095c6.bin
8ce5284da5c2846c46e6529f22d0c382b7c9ce85a54c2838e3846158edaf2822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95C6 10348 bytes
font_01_sfnt_off0000ba66.bin
f6fcf0cdec751ea1629ffc2ecf05c2f5b1be0e4f00d64635cbf782ead8006978		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA66 16120 bytes

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