Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c4a7b3c64f5824…

MALICIOUS

PDF

43.4 KB Created: 2020-03-28 05:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e02d8d19c03c78ee697d48db19ab78b9 SHA-1: c37322992196f2392a037adf47fc29c1ef5afc79 SHA-256: a4c4a7b3c64f582497f78e64639e5486715ac2c9ba020d2b355b780c691c11e1
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on unrelated domains. This pattern is indicative of SEO poisoning or a link farm used to distribute 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 is largely unreadable, but the extensive external linking is the primary indicator of malicious activity.

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://dogknows.net/uploads/1/3/0/6/130621298/130621298.html#constructivismo+y+educaci%C3%B3n+la+concepci%C3%B3n+constructivista+de+la+ense%C3%B1anza+y+el+aprendizaje+pdf
    • http://stillwaterfiretower.com/uploads/1/3/0/6/130639249/bd995e.pdf
    • http://www.matrixsupplyinternational.com/uploads/1/3/0/4/130488252/pulok.pdf
    • http://www.jenzimongthuong.com/uploads/1/3/0/6/130620480/dafodigokosoxaxo.pdf
    • http://massagetherapy-nyc.com/uploads/1/3/0/5/130588729/podifojisibujula.pdf
    • http://pusulaharita.net/uploads/1/3/0/6/130603971/3d5cd59.pdf
    • http://mta-sts.email.strawsermusicstudio.com/uploads/1/3/0/6/130604401/5951118.pdf
    • http://merlene.ca/uploads/1/3/0/7/130740324/sereta.pdf
    • http://neverweatherband.com/uploads/1/3/0/6/130639733/868231.pdf
    • http://vehiclebuybackevent.com/uploads/1/3/0/5/130550868/d63aa99c5455a8.pdf
    • http://dataforgood.design/uploads/1/3/0/4/130489926/sosojumagavetuwi.pdf
    • http://elizabethallick.com/uploads/1/3/0/6/130640227/b6414b438310.pdf
    • http://www.edgarsegarra.com/uploads/1/3/0/3/130324440/62c204.pdf
    • http://workplaceptsdrecovery.com/uploads/1/3/0/6/130620521/3079dbc.pdf
    • http://fringeparenting.com/uploads/1/3/0/7/130739256/4601267.pdf
    • http://rostamcapitalpartners.com/uploads/1/3/0/3/130379653/komaxarofaz_fodenotixeded_fozizisa_vixodewijaj.pdf
    • http://longmontbankruptcy.com/uploads/1/3/1/3/131378970/zirivetarifivowarud.pdf
    • http://morievalleynutracueticals.com/uploads/1/3/0/6/130639026/xajobofarofowi.pdf
    • http://www.jisupark.net/uploads/1/3/0/6/130620719/webotegirulibu_budubuguw_muvibe.pdf
    • http://bhpmedicalconsultants.com/uploads/1/3/0/5/130551597/7294952.pdf
    • http://hostmaster.comppsy.org/uploads/1/3/0/5/130550760/wivoxafamod-zomotum.pdf
    • http://nordiceugenics.com/uploads/1/3/0/3/130379356/bd6944544ab382.pdf
    • http://clclaredo.org/uploads/1/3/0/4/130478772/ac724a326e7a8.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_off00007c7f.bin
e8f771467396b0f13419e0f3875fd993154d998b15f70178d7e8a790b52c2466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7F 8520 bytes

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