Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98d3abdc2c508e9…

MALICIOUS

PDF

39.9 KB Created: 2020-04-02 09:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-10
MD5: 021427fe457b332f414b8f1d90f82bf7 SHA-1: b1dba47395ffb7d637b135a96187489bea8794c0 SHA-256: a98d3abdc2c508e9f167e8d451783fd41b7066d105585ed95752775cd935727c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to URLs that are also present in the heuristics. This suggests the primary purpose is to redirect users to a network of potentially malicious websites, likely for SEO spam or to host further malicious content.

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://abbotsfordappliancerepair.com/uploads/1/3/1/3/131381046/131381046.html#difference+between+dijkstra+prim+and+kruskal PDF link annotation
    • http://christopherajonesjr.com/uploads/1/3/0/4/130436163/1697267.pdfIn PDF document text
    • http://telangaana.info/uploads/1/3/0/6/130620551/motulapuv.pdfIn PDF document text
    • http://negotiatenow.org/uploads/1/3/0/8/130874478/wabosapubajulid-sotemumuwigefuf-baniwi-sikepe.pdfIn PDF document text
    • http://tonypalladino.com/uploads/1/3/0/4/130483396/mapelemubabitop_popigel_ribixi.pdfIn PDF document text
    • http://yourrealtorabouttown.net/uploads/1/3/1/1/131164093/gulagu.pdfIn PDF document text
    • http://destinedforsuccess.rpjandco.com/uploads/1/3/0/5/130542920/gexevanusul.pdfIn PDF document text
    • http://cacaliveyouth.org/uploads/1/3/0/5/130540619/bipudemowabexelezi.pdfIn PDF document text
    • http://northpoleopticalandeye.com/uploads/1/3/0/4/130483811/3275.pdfIn PDF document text
    • http://shoresofmichigan.com/uploads/1/3/0/6/130640142/99a41150ee19a88.pdfIn PDF document text
    • http://jonesandsonsdecorating.com/uploads/1/3/0/7/130738625/2925099.pdfIn PDF document text
    • http://74-123-72-79.mgwnet.com/uploads/1/3/0/4/130476496/2495885.pdfIn PDF document text
    • http://recipetracks.com/uploads/1/3/0/6/130621212/toganevevujabib_wasigipar_sajakanigowoj.pdfIn PDF document text
    • http://thecoveinnnaples.com/uploads/1/3/0/7/130775125/nebar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
🗂 Part of campaign: octarinesec.com 13 samples

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C23 8500 bytes
SHA-256: edbaaa87140bfce4d1f787525ed66391ff37dfc22dcdea15d29753ac435d0e6a
font_01_sfnt_off00007ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE9 16144 bytes
SHA-256: 4bc316074ab7a945bfab345755761abf3c0c30bbefcbffa3ce2a779be7417175

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