Malicious PDF — malware analysis report

Static analysis result for SHA-256 834dc2c92dc5b94c…

MALICIOUS

PDF

35.4 KB Created: 2020-06-11 22:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: d8a8a9d7e381dd333fe8eca75ea0fa2d SHA-1: 2f51648911aaef6e5b96e6c9b32b989779a8074d SHA-256: 834dc2c92dc5b94c7f295cca9cfe2df9f59dde9d18b9fe596126ac60867d490c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection scheme. The document body, though partially corrupted, includes a title related to 'Hyperion installation and configuration troubleshooting guide', which is likely a lure to encourage users to click the embedded links. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm.

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://jtvogelllc.com/uploads/1/3/1/3/131379389/131379389.html#hyperion+installation+and+configuration+troubleshooting+guide PDF link annotation
    • http://mmhma.org/uploads/1/3/0/7/130776408/2259195.pdfIn PDF document text
    • http://cpanel.thedaisyrose.com/uploads/1/3/0/4/130490410/9398851.pdfIn PDF document text
    • http://autodiscover.twhhousing.org/uploads/1/3/0/3/130323417/jitinixidiwotes.pdfIn PDF document text
    • http://thebadassboss.com/uploads/1/3/0/7/130775320/gidivazegekaxupox.pdfIn PDF document text
    • http://saari-ksa.com/uploads/1/3/0/2/130289460/e15b3f12cecccb1.pdfIn PDF document text
    • http://autodiscover.brattleborocjc.org/uploads/1/3/0/5/130540559/3803397.pdfIn PDF document text
    • http://mx.belliesandbundles.com/uploads/1/3/0/4/130436054/wukaxepad_lowas_gamitonovev.pdfIn PDF document text
    • http://growingf8th.net/uploads/1/3/0/8/130813557/00bfc82ff60.pdfIn PDF document text
    • http://vivecafe.net/uploads/1/3/1/6/131607635/a96d437d6db.pdfIn PDF document text
    • http://mta-sts.legacyofzainab.org/uploads/1/3/1/3/131384156/04382df8e1075.pdfIn PDF document text
    • http://nzasthmaguidelines.co.nz/uploads/1/3/0/2/130289649/gomodowe_monoviri.pdfIn PDF document text
    • http://strasburgfamily.info/uploads/1/3/1/4/131452935/vagiwikavigaxo.pdfIn PDF document text
    • http://welsociety.com/uploads/1/3/1/6/131636907/sevenedixitano.pdfIn PDF document text
    • http://hostmaster.winefest.ca/uploads/1/3/0/5/130551399/fbd95cf6a93d3a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://momunijubu866698461.files.wordpress.com/2020/06/motevamizimibipexo.pdfIn PDF document text
    • https://korovite.files.wordpress.com/2020/06/gazonijekurud.pdfIn PDF document text
    • https://xovezuxa802976098.files.wordpress.com/2020/06/fatudef.pdfIn PDF document text
    • https://fisufinolo.files.wordpress.com/2020/06/67598843384.pdfIn PDF document text
    • https://lorirosoxaxe.files.wordpress.com/2020/06/50913272256.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://scripts.sil.org/OFLIn 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_off00005eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAB 10224 bytes
SHA-256: caf6f2540edcc577f4a6d64ca1c1395982023d33279e6ce8565d554e339a35d5

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