Malicious PDF — malware analysis report

Static analysis result for SHA-256 24737bfd058ca9a4…

MALICIOUS

PDF

47.6 KB Created: 2020-03-31 04:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d071371609b6c08e6dba9aa225454697 SHA-1: b116cff6d23ebd99ea494bf2b93c284f357c2e16 SHA-256: 24737bfd058ca9a41442d2f26c2a33aaa568bfb37013ee274b8d604a2d93bd30
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution network for malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://plushhouses.com/uploads/1/3/1/4/131452806/131452806.html#inhibicion+mecanismo+de+defensa+ejemplos
    • http://wizardewallet.com/uploads/1/3/0/2/130289585/91660b9b438035b.pdf
    • http://myacec.com/uploads/1/3/0/6/130604283/24c5bb.pdf
    • http://confluentdesign.org/uploads/1/3/0/5/130590111/8754746.pdf
    • http://sylteszeri.com/uploads/1/3/0/6/130621072/fuxevupavisegi-kajajutidiv-xaxekepopar-dizubizukaxebur.pdf
    • http://coachdeangelis.com/uploads/1/3/0/4/130476244/d4596f4d2c69b6.pdf
    • http://distinctivelivingmckinney.com/uploads/1/3/0/5/130538941/3302636.pdf
    • http://piratesofthetruckee.com/uploads/1/3/0/5/130543070/tunutamuzis-womuxog-sevapokut-sebososa.pdf
    • http://ss-destinydesigners.com/uploads/1/3/1/3/131381553/2bf2d0f333e9fbd.pdf
    • http://shutouttraining.com/uploads/1/3/0/5/130547659/lubewutarevesepevu.pdf
    • http://solidfactories.com/uploads/1/3/0/3/130312969/juxopavibador.pdf
    • http://healthy-addictions.org/uploads/1/3/0/7/130776219/372943.pdf
    • http://beantownscience.com/uploads/1/3/0/6/130621683/8921279.pdf
    • http://pgb-assistante.com/uploads/1/3/1/4/131437472/gukekumaxo.pdf
    • http://anxietyrecoverycambridgeshire.com/uploads/1/3/1/0/131070220/c35424cd5e.pdf
    • http://cannabizstudios.com/uploads/1/3/0/5/130551342/6670874.pdf
    • http://demofaster.com/uploads/1/3/0/5/130545557/9664058.pdf
    • http://thewordsmithacademy.com/uploads/1/3/1/0/131070227/dibubil-rurovibu-kefinexusowege.pdf
    • http://jcslcompany.org/uploads/1/3/0/3/130323290/vikorurenuwara.pdf
    • http://theart-oflife.com/uploads/1/3/1/3/131381237/pivus-vusiwipejifi-wujuvelasogog-danobor.pdf
    • http://greenmountainmangalitsa.com/uploads/1/3/0/3/130323236/ziwimagow-mepubolikejukor-buxolep.pdf
    • http://mydisasterbox.com/uploads/1/3/0/7/130776401/aee20ae43.pdf
    • http://openroadarts.org/uploads/1/3/0/5/130589186/mupigi.pdf
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f81.bin
8c50902682c8f9a27672f8c3c26899e2a8e4a7e713cbbea2c63bbba1bd5d7792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F81 8700 bytes

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