Malicious PDF — malware analysis report

Static analysis result for SHA-256 8441ebdf5294a474…

MALICIOUS

PDF

53.3 KB Created: 2020-03-26 12:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e92d635b54c321b0f42ece313d39883a SHA-1: a0a426e5928e063592c25bcfd6d05f0d64a06f10 SHA-256: 8441ebdf5294a474a84cb78b27b9d0f2bf5994d23f6a7c954058b050fb48b324
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous external links, many pointing to similarly structured URLs, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the link farm heuristic suggest the document is designed to redirect users to potentially malicious content hosted on these external domains. No scripts were extracted, limiting the analysis of direct payload execution.

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://absystemsllcscam.com/uploads/1/3/0/7/130775828/130775828.html#cuales+son+los+elementos+de+una+ficha+de+resumen
    • http://ebindependent.com/uploads/1/3/0/2/130271259/091fc3.pdf
    • http://tijdvoormassage.nl/uploads/1/3/0/7/130740371/bogalosude.pdf
    • http://www.exdiscount.com/uploads/1/3/0/6/130620549/f7cc9367d4afd.pdf
    • http://brandimcmillan.com/uploads/1/3/0/3/130313169/6247500.pdf
    • http://lovejoybreathwork.com/uploads/1/3/0/5/130541744/a8c01d4eff96962.pdf
    • http://merz-verlag-en.com/uploads/1/3/0/2/130289262/ddb0939f4a4.pdf
    • http://mychemicalguys.com/uploads/1/3/0/6/130603815/6b15c5.pdf
    • http://hippieretreat.org/uploads/1/3/0/6/130639055/9741955.pdf
    • http://lv01.hendersonchamber.com/uploads/1/3/0/3/130313531/9394683.pdf
    • http://grassrootsdocu.com/uploads/1/3/0/4/130483810/759421.pdf
    • http://amazingcloaker.com/uploads/1/3/0/2/130271002/somamakir_tinajakitaseni_limari.pdf
    • http://cpanel.coffeeloud.com/uploads/1/3/0/9/130969604/burebaladene.pdf
    • http://grafixcity.com/uploads/1/3/0/6/130604580/noxufasakosokodimog.pdf
    • http://makingkidsmatterllc.com/uploads/1/3/0/6/130622007/tixibamemibelofekoka.pdf
    • http://lemurjewels.net/uploads/1/3/0/8/130814851/9673325.pdf
    • http://best-office-bueroservice.de/uploads/1/3/0/5/130545882/7b01554889a.pdf
    • http://www.clayandgrover.com/uploads/1/3/0/6/130604820/pibusokutaguj-lisuzu.pdf
    • http://shicachic.com/uploads/1/3/0/5/130590162/c6ef31ecdd0b82f.pdf
    • http://ladieseducationservices.com/uploads/1/3/0/7/130738841/b9ce6ffaf9c968a.pdf
    • http://eaglesnesthomeinspectionsllc.com/uploads/1/3/0/5/130539393/retuga_davuvitod_zoleterekizivo.pdf
    • http://www.wildteraniafarm.com/uploads/1/3/0/5/130540397/4368095.pdf
    • http://plusconstruction.org/uploads/1/3/0/4/130476013/9afc4586.pdf
    • http://jessemarks.nl/uploads/1/3/0/7/130740086/f71ee.pdf
    • http://www.eipef.eu/uploads/1/3/0/3/130312919/vamumipiz_kowilamisavomag_pezupav_tuvawasujen.pdf
    • http://www.eipef.eu/uploads/1/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d17.bin
640b65c065dd1cc6f02f47e0a9cbe2d85373ca6461e5086b2cf51b352d424140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D17 9692 bytes
font_01_sfnt_off0000af98.bin
0437ae0a8c3b0d4d0bca19117c23f937da5e886acb635ecc2018453b05816554		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF98 16168 bytes

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