Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3daf5940b13d21…

MALICIOUS

PDF

37.5 KB Created: 2020-03-29 06:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: c0fff63f80927c3623a22d6982c06a7e SHA-1: 5276bc2546b60e5b92d3fcc99bb0a1c363a7ad2f SHA-256: 1b3daf5940b13d2134955a04aca2e86fdee427c87067d50c58c1ec10a6186e3b
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 are numerically or generically named, suggesting a link farm for SEO purposes. The document body, though partially corrupted, contains text related to a 'scientific method worksheet answer key' and references the wkhtmltopdf tool, indicating a lure to disguise the malicious intent. The primary heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is a link farm, likely used for distributing further malware or phishing 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://mta-sts.mx.letiziaiannaccone.com/uploads/1/3/1/1/131163832/131163832.html#scientific+method+worksheet+8th+grade+answer+key PDF link annotation
    • http://www.flightsandfinedines.com/uploads/1/3/0/2/130289734/6132725.pdfIn PDF document text
    • http://blwworld.com/uploads/1/3/0/6/130604860/eb9cd2672076f.pdfIn PDF document text
    • http://utopiaincazadero.com/uploads/1/3/0/2/130289653/dipapiwekixanepase.pdfIn PDF document text
    • http://micreditousa.com/uploads/1/3/0/5/130588789/5cd2682a7d.pdfIn PDF document text
    • http://www.jesusisafunman.com/uploads/1/3/0/2/130272905/95896eba.pdfIn PDF document text
    • http://akifujitani.com/uploads/1/3/0/4/130476974/8098044.pdfIn PDF document text
    • http://janineibbotson.org/uploads/1/3/0/7/130775031/e1ddd4aea5da080.pdfIn PDF document text
    • http://autodiscover.fpcmorganton.org/uploads/1/3/0/2/130272853/lerusawelovida.pdfIn PDF document text
    • http://thezelinkareport.com/uploads/1/3/0/3/130323515/1431670.pdfIn PDF document text
    • http://folkochstad.se/uploads/1/3/0/7/130739197/5119293.pdfIn PDF document text
    • http://activatinggraphics.org/uploads/1/3/0/7/130739316/44887d2e74a75c.pdfIn PDF document text
    • http://longplumbers.com/uploads/1/3/0/5/130588749/3337132.pdfIn PDF document text
    • http://krgabogados.com/uploads/1/3/0/4/130483552/zeguz-xiretetob-lusikaxilug-sakesupepijup.pdfIn PDF document text
    • http://norissa.net/uploads/1/3/1/0/131070852/tujik.pdfIn PDF document text
    • http://paintrockperformance.com/uploads/1/3/0/6/130620460/8b4a2444c1dc3d.pdfIn PDF document text
    • http://miideax.com/uploads/1/3/0/2/130287419/jesawakebof_tisevon_pitifujoxivekow.pdfIn PDF document text
    • http://pmnecc.org/uploads/1/3/0/5/130551282/xikoxiribi.pdfIn PDF document text
    • http://mta-sts.mx.mendedhearts117.org/uploads/1/3/0/5/130588289/3cc080df77632c6.pdfIn PDF document text
    • http://burgislawgroup.com/uploads/1/3/0/7/130739129/tuxumipanunep_jojifo_pesugit.pdfIn PDF document text
    • http://barkleypet.com/uploads/1/3/0/5/130590399/c3cc0b2b.pdfIn PDF document text
    • http://secureentphotos.com/uploads/1/3/0/4/130483678/jijixudulojuko.pdfIn PDF document text
    • http://hollyebrown.com/uploads/1/3/0/5/130543663/fitotififotegaf.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 8

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_off00006904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6904 8116 bytes
SHA-256: 7fab36b6527bec490f1eb6d7210c827caf3468ae06e59f11ae994da8d5f9b424

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