Malicious PDF — malware analysis report

Static analysis result for SHA-256 78303817c3963a76…

MALICIOUS

PDF

77.6 KB Created: 2020-06-11 21:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81c9388dab74d360086816c8043404b3 SHA-1: 024b1ccb817e81f8614283448afbcb40195ee19f SHA-256: 78303817c3963a767c482656686fa7f099e6fa56ee2200264b000e1e73612b47
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of external links points to a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://g83gb.bpmtc.com/uploads/1/3/0/7/130775912/130775912.html#ouija+board+stories+yahoo+answers
    • http://aldridgeteach.com/uploads/1/3/1/1/131164311/ximubijodelenexu.pdf
    • http://ecartorio.com/uploads/1/3/0/7/130776877/350520.pdf
    • http://montereybaysucculents.com/uploads/1/3/0/7/130740376/vidib.pdf
    • http://under-pressure-fl.com/uploads/1/3/1/3/131383543/cdea558b8d.pdf
    • http://hostmaster.hearsesigns.com/uploads/1/3/0/9/130969722/jusezovubusoven.pdf
    • http://cooperengineeredservices.com/uploads/1/3/0/2/130288802/8235578.pdf
    • http://qpessentials.com/uploads/1/3/0/7/130739656/32abd8765.pdf
    • http://olivebranchcafe.co.uk/uploads/1/3/1/3/131383934/romisunawizupet.pdf
    • http://autodiscover.straightofftheranch.com/uploads/1/3/1/8/131856743/relomo-vusonozotozokoz-xakazatunewi.pdf
    • http://naturalyorganica.com/uploads/1/3/0/9/130969878/56719a5313e534.pdf
    • http://racingairproducts.com/uploads/1/3/1/8/131857598/1763572.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zapekijibu.files.wordpress.com/2020/06/joresafokupuba.pdf
    • https://bujadite.files.wordpress.com/2020/06/75940935036.pdf
    • https://sirozujulad.files.wordpress.com/2020/06/9186424639.pdf
    • https://muranutuba.files.wordpress.com/2020/06/78003524452.pdf
    • https://mekerug368181460.files.wordpress.com/2020/06/52746203400.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1e.bin
6701648d081187116806f53f0ff901b0fb26564d3f2737bb21af7db7e2c04b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 12380 bytes

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