Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4dab91db334d75f…

MALICIOUS

PDF

41.4 KB Created: 2020-03-27 05:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 8d5ca024426ef8050dfd2b249ae0a57b SHA-1: 909c6d24bd6b8dba05177036b97e7fef1e5f26c8 SHA-256: d4dab91db334d75fc13e0b4f623f6a75fee45cb19e25cae742ba3e6e4545c441
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 PDFs hosted on different domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The document body itself contains garbled text and a few URLs, reinforcing the idea that the primary purpose is to redirect users. No scripts were extracted, limiting the ability to determine a more specific attack pattern.

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://sbl365.net/uploads/1/3/1/4/131411762/131411762.html#operaciones+con+fracciones+aritm%C3%A9ticas+suma+resta+multiplicaci%C3%B3n+y+divisi%C3%B3n+pdf PDF link annotation
    • http://artcreations.us/uploads/1/3/0/2/130289478/1893006.pdfIn PDF document text
    • http://uptowngrillecf.com/uploads/1/3/0/5/130544230/1142910.pdfIn PDF document text
    • http://www.larasthemecakes.co.uk/uploads/1/3/0/6/130621472/ba9e641ceab.pdfIn PDF document text
    • http://world-with-elegance.com/uploads/1/3/0/6/130621052/nelib-kuruvi-voguwebifil.pdfIn PDF document text
    • http://www.happywood.info/uploads/1/3/0/7/130738732/da80ab28931e9.pdfIn PDF document text
    • http://thebreatheinstitute.org/uploads/1/3/0/5/130590164/feluzelerasiwe.pdfIn PDF document text
    • http://chichidigital.com/uploads/1/3/0/2/130289354/1c588839607.pdfIn PDF document text
    • http://75-50-210-143.diamonddoorltd.com/uploads/1/3/0/6/130639678/fijomaxe.pdfIn PDF document text
    • http://ezobord.de/uploads/1/3/0/2/130287278/bea1f0960c6eb.pdfIn PDF document text
    • http://fiftycentfantasy.com/uploads/1/3/0/7/130775166/jonoveku.pdfIn PDF document text
    • http://cbdisolateuses.com/uploads/1/3/0/7/130775950/mosasevi-xizuse-fobibisov.pdfIn PDF document text
    • http://greenkwest.com/uploads/1/3/0/4/130476262/274179.pdfIn PDF document text
    • http://babuni.ca/uploads/1/3/0/2/130287934/7171186.pdfIn PDF document text
    • http://nerdysecretsinside.online/uploads/1/3/0/4/130478205/xatunuwa.pdfIn PDF document text
    • http://chickflickguide.com/uploads/1/3/0/7/130775197/631efa43.pdfIn PDF document text
    • http://webmail.ordbrighideach.org/uploads/1/3/0/6/130639468/9357851.pdfIn PDF document text
    • http://carsforfood.com/uploads/1/3/0/8/130814032/8e426f26e.pdfIn PDF document text
    • http://lellynphotography.org/uploads/1/3/0/5/130539111/801afe1c6.pdfIn PDF document text
    • http://www.glassfestivalen.se/uploads/1/3/0/6/130621212/8f4fa47fbb73.pdfIn PDF document text
    • http://mta-sts.unstufforganizing.com/uploads/1/3/0/4/130476221/labivifefijifazipuna.pdfIn PDF document text
    • http://blessyourhearthbooks.com/uploads/1/3/0/5/130551319/tolekusevu.pdfIn PDF document text
    • http://empireofthedead.org/uploads/1/3/0/6/130621546/xanore-denunumu.pdfIn PDF document text
    • http://www.aimforwardinc.com/uploads/1/3/0/6/130620265/434095.pdfIn PDF document text
    • http://rocknrollschools.com/uploads/1/3/0/7/130740012/5420516.pdfIn PDF document text
    • http://krissyoneill.com/uploads/1/3/0/8/130874475/9549121.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

Related samples 3

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74FE 8300 bytes
SHA-256: 4ca2be704586b559bc3d33e6372a587237e2755691e253ad6bf82f1fc797a70f

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