Malicious PDF — malware analysis report

Static analysis result for SHA-256 2323405088583ed5…

MALICIOUS

PDF

32.7 KB Created: 2020-05-15 07:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: b2f5828ee8b5fe8912488f36b7e5def8 SHA-1: 15af453a7b772b48545dbe5b8afbb2bba05f4343 SHA-256: 2323405088583ed54474f1c92400a4370b56e6b06ddcdffc6b639edfd5e55332
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, also contains URLs. This suggests the primary purpose is to redirect users to a network of websites, likely for SEO spam or to host further malicious content. The ML classifier strongly supports the malicious verdict.

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://65bancker.com/uploads/1/3/0/7/130776241/130776241.html#flyff+element+weakness+guide PDF link annotation
    • http://greenscreamdayz.com/uploads/1/3/0/5/130588571/sojobopu.pdfIn PDF document text
    • http://alturasartcenter.com/uploads/1/3/0/2/130289601/aa8caf.pdfIn PDF document text
    • http://debbiecopeland.net/uploads/1/3/1/3/131380440/6376313.pdfIn PDF document text
    • http://medrecords.online/uploads/1/3/0/2/130272365/c4517e3.pdfIn PDF document text
    • http://tbclynchburg.org/uploads/1/3/0/3/130379596/xitekodo.pdfIn PDF document text
    • http://oxbowpublishing.com/uploads/1/3/0/5/130543212/tadumiwofu.pdfIn PDF document text
    • http://hp-imoney.com/uploads/1/3/1/8/131872198/eef8e81cd5eb.pdfIn PDF document text
    • http://4mahin.com/uploads/1/3/1/4/131406182/giduwizunalivu.pdfIn PDF document text
    • http://oiltycoons.com/uploads/1/3/0/8/130874583/5b79da490becbaa.pdfIn PDF document text
    • http://tijdvoorfysiotherapie.nl/uploads/1/3/0/7/130739344/zoviganap_febelujimiv.pdfIn PDF document text
    • http://dacunhalaw.com/uploads/1/3/0/8/130874201/8951165.pdfIn PDF document text
    • http://johnd2000.com/uploads/1/3/0/2/130288775/809ec.pdfIn PDF document text
    • http://ingathompsonfoundation.com/uploads/1/3/0/2/130271243/120070.pdfIn PDF document text
    • http://dairycareaction.org/uploads/1/3/0/2/130289561/ca500.pdfIn PDF document text
    • http://cassidytrom.com/uploads/1/3/0/6/130603761/geduzik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000555e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x555E 9960 bytes
SHA-256: aa034b2caf1ea4737fe242fec1f6e9e3cdf947bea2dec118cec2599e6f098f10

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